{"id":3738,"date":"2026-04-24T19:49:59","date_gmt":"2026-04-24T19:49:59","guid":{"rendered":"https:\/\/www.captcha.eu\/?p=3738"},"modified":"2026-04-24T19:53:28","modified_gmt":"2026-04-24T19:53:28","slug":"altcha-vs-captchaeu","status":"publish","type":"post","link":"https:\/\/www.captcha.eu\/fr\/altcha-vs-captchaeu\/","title":{"rendered":"ALTCHA vs CAPTCHA.eu : Open Source ou CAPTCHA g\u00e9r\u00e9 ?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large is-resized\"><img data-dominant-color=\"c4d6ec\" data-has-transparency=\"false\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-1024x576.jpg\" alt=\"Illustration comparing open source CAPTCHA and managed CAPTCHA solutions, highlighting benefits like customization and control versus security, analytics, and professional support in a side-by-side comparison.\" class=\"wp-image-3740 not-transparent\" style=\"--dominant-color: #c4d6ec; width:1200px;height:auto\" srcset=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-1024x576.jpg 1024w, https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-300x169.jpg 300w, https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-768x432.jpg 768w, https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-1536x864.jpg 1536w, https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1-18x10.jpg 18w, https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-2-1.jpg 1920w\" \/><figcaption class=\"wp-element-caption\">captcha.eu<\/figcaption><\/figure>\n\n\n\n<p>ALTCHA and CAPTCHA.eu solve the same problem: bot protection without cookies or reCAPTCHA&#8217;s privacy overhead, but they do it in fundamentally different ways. ALTCHA is open-source and self-hosted. CAPTCHA.eu is a managed, EU-hosted service. The right choice depends on how much infrastructure your team wants to own and what your compliance situation actually requires.<\/p>\n\n\n\n<p class=\"wp-block-yoast-seo-estimated-reading-time yoast-reading-time__wrapper\"><span class=\"yoast-reading-time__icon\"><svg aria-hidden=\"true\" focusable=\"false\" data-icon=\"clock\" width=\"20\" height=\"20\" fill=\"none\" stroke=\"currentColor\" style=\"display:inline-block;vertical-align:-0.1em\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z\"><\/path><\/svg><\/span><span class=\"yoast-reading-time__spacer\" style=\"display:inline-block;width:1em\"><\/span><span class=\"yoast-reading-time__descriptive-text\">Estimated reading time: <\/span><span class=\"yoast-reading-time__reading-time\">12<\/span><span class=\"yoast-reading-time__time-unit\"> minutes<\/span><\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-input-field-color has-primary-background-color has-text-color has-background has-link-color has-border-color has-border-border-color wp-element-button\" href=\"https:\/\/www.captcha.eu\/login\" style=\"border-width:1px\">Try CAPTCHA.eu free &#8211; no credit card<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-sky-blue-color has-background-background-color has-text-color has-background has-link-color has-border-color has-border-border-color wp-element-button\" href=\"https:\/\/docs.captcha.eu\/\" style=\"border-width:1px\">View all integrations<\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-premium-container premium-container-dad17d69e8d3  alignfull premium-is-root-container\"><div class=\"premium-container-inner-blocks-wrap\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-6c531013 wp-block-group-is-layout-flex\">\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-3skse\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-3skse \"><div class=\"eb-infobox-3skse eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\"><strong><strong>The core difference<\/strong><\/strong><\/h3><p class=\"description\">ALTCHA runs on your own infrastructure. <a href=\"http:\/\/CAPTCHA.eu\" target=\"_blank\" rel=\"noreferrer noopener\">CAPTCHA.eu<\/a> runs on ours. That single difference drives almost every other trade-off in this comparison<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-f13s5\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-f13s5 \"><div class=\"eb-infobox-f13s5 eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\"><strong><strong><strong>Who ALTCHA suits<\/strong><\/strong><\/strong><\/h3><p class=\"description\">Teams with DevOps capacity who want full data sovereignty, are comfortable with Docker\/Kubernetes, and are willing to own maintenance and uptime<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-gu5or\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-gu5or \"><div class=\"eb-infobox-gu5or eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\"><strong><strong>Who CAPTCHA.eu suits<\/strong><\/strong><\/h3><p class=\"description\">Teams who want verified EU hosting, zero ops overhead, official plugins for WordPress and TYPO3, and a straightforward compliance story for DPOs<\/p><\/div><\/div><\/div><\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"root-eb-toc-mvnk2 wp-block-essential-blocks-table-of-contents\"><div class=\"eb-parent-wrapper eb-parent-eb-toc-mvnk2 \"><div class=\"eb-toc-container eb-toc-mvnk2  eb-toc-is-not-sticky eb-toc-collapsible eb-toc-initially-not-collapsed eb-toc-scrollToTop style-1 list-style-none\" data-scroll-top=\"false\" data-scroll-top-icon=\"fas fa-angle-up\" data-collapsible=\"true\" data-sticky-hide-mobile=\"false\" data-sticky=\"false\" data-scroll-target=\"scroll_to_toc\" data-copy-link=\"false\" data-editor-type=\"\" data-hide-desktop=\"false\" data-hide-tab=\"false\" data-hide-mobile=\"false\" data-itemCollapsed=\"false\" data-highlight-scroll=\"false\"><div class=\"eb-toc-header\"><h2 class=\"eb-toc-title\">What this guide covers<\/h2><\/div><div class=\"eb-toc-wrapper \" data-headers=\"[{&quot;level&quot;:2,&quot;content&quot;:&quot;What both solutions actually are&quot;,&quot;text&quot;:&quot;What both solutions actually are&quot;,&quot;link&quot;:&quot;what-both-solutions-actually-are&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Side-by-side comparison&quot;,&quot;text&quot;:&quot;Side-by-side comparison&quot;,&quot;link&quot;:&quot;side-by-side-comparison&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Hosting and data location&quot;,&quot;text&quot;:&quot;Hosting and data location&quot;,&quot;link&quot;:&quot;hosting-and-data-location&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Security model and threat response&quot;,&quot;text&quot;:&quot;Security model and threat response&quot;,&quot;link&quot;:&quot;security-model-and-threat-response&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Setup, maintenance, and ops overhead&quot;,&quot;text&quot;:&quot;Setup, maintenance, and ops overhead&quot;,&quot;link&quot;:&quot;setup-maintenance-and-ops-overhead&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;GDPR and compliance documentation&quot;,&quot;text&quot;:&quot;GDPR and compliance documentation&quot;,&quot;link&quot;:&quot;gdpr-and-compliance-documentation&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Platform integrations&quot;,&quot;text&quot;:&quot;Platform integrations&quot;,&quot;link&quot;:&quot;platform-integrations&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Cost comparison&quot;,&quot;text&quot;:&quot;Cost comparison&quot;,&quot;link&quot;:&quot;cost-comparison&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Which one should you choose?&quot;,&quot;text&quot;:&quot;Which one should you choose?&quot;,&quot;link&quot;:&quot;which-one-should-you-choose&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Try CAPTCHA.eu free \\u2014 no credit card, no infrastructure setup&quot;,&quot;text&quot;:&quot;Try CAPTCHA.eu free \\u2014 no credit card, no infrastructure setup&quot;,&quot;link&quot;:&quot;try-captchaeu-free-no-credit-card-no-infrastructure-setup&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Frequently Asked Questions&quot;,&quot;text&quot;:&quot;Frequently Asked Questions&quot;,&quot;link&quot;:&quot;frequently-asked-questions&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Related reading&quot;,&quot;text&quot;:&quot;Related reading&quot;,&quot;link&quot;:&quot;related-reading&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Use the migration moment to simplify your stack&quot;,&quot;text&quot;:&quot;Use the migration moment to simplify your stack&quot;,&quot;link&quot;:&quot;use-the-migration-moment-to-simplify-your-stack&quot;}]\" data-visible=\"[true,true,false,false,false,false]\" data-delete-headers=\"[{&quot;label&quot;:&quot;What both solutions actually are&quot;,&quot;value&quot;:&quot;what-both-solutions-actually-are&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Side-by-side comparison&quot;,&quot;value&quot;:&quot;side-by-side-comparison&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Hosting and data location&quot;,&quot;value&quot;:&quot;hosting-and-data-location&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Security model and threat response&quot;,&quot;value&quot;:&quot;security-model-and-threat-response&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Setup, maintenance, and ops overhead&quot;,&quot;value&quot;:&quot;setup-maintenance-and-ops-overhead&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;GDPR and compliance documentation&quot;,&quot;value&quot;:&quot;gdpr-and-compliance-documentation&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Platform integrations&quot;,&quot;value&quot;:&quot;platform-integrations&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Cost comparison&quot;,&quot;value&quot;:&quot;cost-comparison&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Which one should you choose?&quot;,&quot;value&quot;:&quot;which-one-should-you-choose&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Try CAPTCHA.eu free \\u2014 no credit card, no infrastructure setup&quot;,&quot;value&quot;:&quot;try-captchaeu-free-no-credit-card-no-infrastructure-setup&quot;,&quot;isDelete&quot;:true},{&quot;label&quot;:&quot;Frequently Asked Questions&quot;,&quot;value&quot;:&quot;frequently-asked-questions&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Related reading&quot;,&quot;value&quot;:&quot;related-reading&quot;,&quot;isDelete&quot;:true},{&quot;label&quot;:&quot;Use the migration moment to simplify your stack&quot;,&quot;value&quot;:&quot;use-the-migration-moment-to-simplify-your-stack&quot;,&quot;isDelete&quot;:true}]\" data-smooth=\"true\" data-top-offset=\"\"><div class=\"eb-toc__list-wrap\"><ul class='eb-toc__list'><li><a href=\"#what-both-solutions-actually-are\">What both solutions actually are<\/a><li><a href=\"#side-by-side-comparison\">Side-by-side comparison<\/a><li><a href=\"#hosting-and-data-location\">Hosting and data location<\/a><li><a href=\"#security-model-and-threat-response\">Security model and threat response<\/a><li><a href=\"#setup-maintenance-and-ops-overhead\">Setup, maintenance, and ops overhead<\/a><li><a href=\"#gdpr-and-compliance-documentation\">GDPR and compliance documentation<\/a><li><a href=\"#platform-integrations\">Platform integrations<\/a><li><a href=\"#cost-comparison\">Cost comparison<\/a><li><a href=\"#which-one-should-you-choose\">Which one should you choose?<\/a><li><a href=\"#frequently-asked-questions\">Frequently Asked Questions<\/a><\/ul><\/div><\/div><\/div><\/div><\/div>\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-edjna\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-edjna \"><div class=\"eb-infobox-edjna eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">Transparency notice<\/h3><p class=\"description\">This article is written by the CAPTCHA.eu team and includes our own product. We have aimed to characterise ALTCHA fairly based on its public documentation and open-source code. Where our product has an advantage, we say so directly. Where ALTCHA has a genuine advantage, we acknowledge it. If you find an inaccuracy,\u00a0<a href=\"https:\/\/www.captcha.eu\/contact-us\/\">contact us<\/a>.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-16ab0c4288b4a38d29e6e54eebc08fa0\" id=\"h-what-both-solutions-actually-are\" style=\"color:#2b7ca4\">What both solutions actually are<\/h2>\n\n\n\n<p>Both ALTCHA and CAPTCHA.eu use proof-of-work verification to protect websites from automated bots. Neither sets cookies for the CAPTCHA function, neither shows users image puzzles, and both position themselves as privacy-compliant alternatives to reCAPTCHA. The underlying approach is similar. The delivery model is not.<\/p>\n\n\n\n<p><strong>ALTCHA<\/strong>&nbsp;is an open-source project licensed under MIT. The core widget is free. For production-grade protection, teams deploy ALTCHA Sentinel: a self-hosted backend that adds adaptive CAPTCHA, threat intelligence, machine learning classification, and rate limiting. Sentinel runs on your own Docker or Kubernetes infrastructure. You own the deployment, the data, and the uptime.<\/p>\n\n\n\n<p><strong>CAPTCHA.eu<\/strong>&nbsp;is a managed SaaS service. You integrate a JavaScript widget, and CAPTCHA.eu handles verification, infrastructure, threat intelligence, and uptime from data centres in Austria. No server to deploy, no backend to maintain, no ops work beyond the initial integration.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-db7260d7c2d3218b15b5b138828fbe3c\" id=\"h-side-by-side-comparison\" style=\"color:#2b7ca4\">Side-by-side comparison<\/h2>\n\n\n\n<figure class=\"wp-block-riovizual-tablebuilder is-style-regular rv_tb-3812386e-6f0b-4829-b08f-ffb94401a33e is-scroll-on-mobile\" rv-tb-responsive-breakpoint=\"768px\"><table class=\"\"><thead><tr><th class=\"rv_tb-cell rv_tb-row-0-cell-0 rv_tb-rs-row-0-cell-0 rv_tb-cs-row-0-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">FEATURE<\/div><\/div><\/div><\/th><th class=\"rv_tb-cell rv_tb-row-0-cell-1 rv_tb-rs-row-0-cell-1 rv_tb-cs-row-0-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">ALTCHA (self-hosted)<\/div><\/div><\/div><\/th><th class=\"rv_tb-cell rv_tb-row-0-cell-2 rv_tb-rs-row-0-cell-2 rv_tb-cs-row-0-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">CAPTCHA.EU (managed)<\/div><\/div><\/div><\/th><\/tr><\/thead><tbody><tr><td class=\"rv_tb-cell rv_tb-row-1-cell-0 rv_tb-rs-row-1-cell-0 rv_tb-cs-row-1-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Verification approach<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-1-cell-1 rv_tb-rs-row-1-cell-1 rv_tb-cs-row-1-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Proof-of-work (core); adaptive PoW + ML classification (Sentinel). Widget v3 uses memory-bound Argon2 and Scrypt algorithms that neutralise GPU\/ASIC acceleration by bot farms<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-1-cell-2 rv_tb-rs-row-1-cell-2 rv_tb-cs-row-1-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Proof-of-work + contextual signal analysis per request<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-2-cell-0 rv_tb-rs-row-2-cell-0 rv_tb-cs-row-2-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Hosting model<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-2-cell-1 rv_tb-rs-row-2-cell-1 rv_tb-cs-row-2-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Self-hosted on your infrastructure (Docker, Kubernetes, AWS, Azure)<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-2-cell-2 rv_tb-rs-row-2-cell-2 rv_tb-cs-row-2-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Fully managed, hosted in Austria (EU)<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-3-cell-0 rv_tb-rs-row-3-cell-0 rv_tb-cs-row-3-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Data location<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-3-cell-1 rv_tb-rs-row-3-cell-1 rv_tb-cs-row-3-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Wherever you deploy: you control it<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-3-cell-2 rv_tb-rs-row-3-cell-2 rv_tb-cs-row-3-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Austria on all commercial plans, by default<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-4-cell-0 rv_tb-rs-row-4-cell-0 rv_tb-cs-row-4-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Cookies<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-4-cell-1 rv_tb-rs-row-4-cell-1 rv_tb-cs-row-4-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">None in default mode. An optional cookie configuration exists in the widget API but is not enabled by default<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-4-cell-2 rv_tb-rs-row-4-cell-2 rv_tb-cs-row-4-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">None for CAPTCHA function<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-5-cell-0 rv_tb-rs-row-5-cell-0 rv_tb-cs-row-5-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Open source<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-5-cell-1 rv_tb-rs-row-5-cell-1 rv_tb-cs-row-5-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Yes: widget and core under MIT license<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-5-cell-2 rv_tb-rs-row-5-cell-2 rv_tb-cs-row-5-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">No: closed source SaaS<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-6-cell-0 rv_tb-rs-row-6-cell-0 rv_tb-cs-row-6-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Setup complexity<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-6-cell-1 rv_tb-rs-row-6-cell-1 rv_tb-cs-row-6-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Docker or Kubernetes deployment required for Sentinel<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-6-cell-2 rv_tb-rs-row-6-cell-2 rv_tb-cs-row-6-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">JavaScript snippet + API key, no server required<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-7-cell-0 rv_tb-rs-row-7-cell-0 rv_tb-cs-row-7-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Maintenance<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-7-cell-1 rv_tb-rs-row-7-cell-1 rv_tb-cs-row-7-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">You manage updates, security patches, and uptime<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-7-cell-2 rv_tb-rs-row-7-cell-2 rv_tb-cs-row-7-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Fully managed, no maintenance on your side<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-8-cell-0 rv_tb-rs-row-8-cell-0 rv_tb-cs-row-8-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">WordPress plugin<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-8-cell-1 rv_tb-rs-row-8-cell-1 rv_tb-cs-row-8-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Official plugin (V2, released 2026)<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-8-cell-2 rv_tb-rs-row-8-cell-2 rv_tb-cs-row-8-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Official plugin<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-9-cell-0 rv_tb-rs-row-9-cell-0 rv_tb-cs-row-9-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">TYPO3 plugin<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-9-cell-1 rv_tb-rs-row-9-cell-1 rv_tb-cs-row-9-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Not available<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-9-cell-2 rv_tb-rs-row-9-cell-2 rv_tb-cs-row-9-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Official plugin (EXT:form + PowerMail)<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-10-cell-0 rv_tb-rs-row-10-cell-0 rv_tb-cs-row-10-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Keycloak plugin<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-10-cell-1 rv_tb-rs-row-10-cell-1 rv_tb-cs-row-10-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Community JAR (registration flow only)<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-10-cell-2 rv_tb-rs-row-10-cell-2 rv_tb-cs-row-10-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Official JAR (login, registration, and password reset)<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-11-cell-0 rv_tb-rs-row-11-cell-0 rv_tb-cs-row-11-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">WCAG 2.2 AA<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-11-cell-1 rv_tb-rs-row-11-cell-1 rv_tb-cs-row-11-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Self-declared compliant<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-11-cell-2 rv_tb-rs-row-11-cell-2 rv_tb-cs-row-11-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Independently certified by T\u00dcV Austria<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-12-cell-0 rv_tb-rs-row-12-cell-0 rv_tb-cs-row-12-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">GDPR DPA<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-12-cell-1 rv_tb-rs-row-12-cell-1 rv_tb-cs-row-12-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Not applicable (you host it)<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-12-cell-2 rv_tb-rs-row-12-cell-2 rv_tb-cs-row-12-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Standard DPA available<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-13-cell-0 rv_tb-rs-row-13-cell-0 rv_tb-cs-row-13-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Pricing model<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-13-cell-1 rv_tb-rs-row-13-cell-1 rv_tb-cs-row-13-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Free core; Sentinel Professional \u20ac99\/month, Enterprise \u20ac799\/month (April 2026, excl. infrastructure). 30-day free trial available<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-13-cell-2 rv_tb-rs-row-13-cell-2 rv_tb-cs-row-13-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Usage-based; free tier available, paid plans from captcha.eu\/pricing<\/div><\/div><\/div><\/td><\/tr><tr><td class=\"rv_tb-cell rv_tb-row-14-cell-0 rv_tb-rs-row-14-cell-0 rv_tb-cs-row-14-cell-0\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Reference customers<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-14-cell-1 rv_tb-rs-row-14-cell-1 rv_tb-cs-row-14-cell-1\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">Government agencies and enterprises (not publicly named)<\/div><\/div><\/div><\/td><td class=\"rv_tb-cell rv_tb-row-14-cell-2 rv_tb-rs-row-14-cell-2 rv_tb-cs-row-14-cell-2\"><div class=\"rv_tb-element\"><div class=\"rv_tb-text-wrap rv_justify cell-element-0\"><div class=\"rv_tb-text\">\u00d6BB, OeNB, DGUV, A1, MG (publicly named)<\/div><\/div><\/div><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-40b1f89533137d05cc3e9f648fc87363\" id=\"h-hosting-and-data-location\" style=\"color:#2b7ca4\">Hosting and data location<\/h2>\n\n\n\n<p>This is the most consequential difference for European teams, and it cuts in both directions depending on your situation.<\/p>\n\n\n\n<p>With ALTCHA, you control where verification data lives entirely. If your organisation has strict data residency requirements (for example, a government agency that cannot process any data on third-party infrastructure), ALTCHA&#8217;s self-hosted model is structurally the right answer. No third-party receives any request data because there is no third party.<\/p>\n\n\n\n<p>With CAPTCHA.eu, verification requests are processed in Austria on all commercial plans. Austria is an EU member state, so GDPR applies, there are no US data transfers, and the processing location is fixed and documentable. For most European website operators, this is the simpler path: you point your DPO at a known Austrian data centre rather than at your own deployment.<\/p>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-f44he\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-f44he \"><div class=\"eb-infobox-f44he eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">The key question for your situation<\/h3><p class=\"description\">Can you use a third-party processor at all? If yes, CAPTCHA.eu&#8217;s managed Austria-hosted model gives you a clean, simple compliance story with no infrastructure overhead. If not (for example, because internal policy or regulation prohibits it entirely), ALTCHA&#8217;s self-hosted model is the only viable option here.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-a3ffa87deb255f804e58edaff4f185c6\" id=\"h-security-model-and-threat-response\" style=\"color:#2b7ca4\">Security model and threat response<\/h2>\n\n\n\n<p>Both solutions use proof-of-work at the base layer, which means neither relies on cookies, cross-site behavioral profiling, or user fingerprinting. That is the shared starting point. Where they diverge is in how threat intelligence gets updated when bot patterns change.<\/p>\n\n\n\n<p>ALTCHA Sentinel includes threat intelligence: IP reputation databases, ML classification, and human interaction signature analysis. However, keeping those defences current requires you to update Sentinel on your own infrastructure. When ALTCHA releases a new version with improved bot detection, you deploy it. When a new threat pattern emerges, response time depends on your team&#8217;s patching cadence.<\/p>\n\n\n\n<p>CAPTCHA.eu updates threat intelligence and signal analysis centrally. All protected sites benefit from improvements simultaneously without any action required from individual customers. This is the classic managed-vs-self-hosted trade-off in security: self-hosted gives you control; managed gives you speed of response.<\/p>\n\n\n\n<p>One genuine technical strength of ALTCHA worth noting: Widget v3, released in April 2026, makes automated attacks more expensive by forcing attackers to spend more memory and computing power per verification attempt. Technically, this works through memory-bound algorithms called Argon2 and Scrypt, which neutralise GPU and ASIC hardware acceleration, the tools bot farms use to process challenges cheaply at scale. It is a thoughtful design choice that goes beyond basic proof-of-work. CAPTCHA.eu uses a different approach (contextual signal analysis per request rather than client-side computational hardening), but the ALTCHA v3 architecture is a genuine advancement that anyone seriously evaluating the two should understand.<\/p>\n\n\n\n<p>For most website operators, bot patterns evolve faster than internal patching cycles can match. For security-focused teams with dedicated DevOps capacity, the control that comes with self-hosting may outweigh the convenience of managed updates.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-7e0cb3c74cff76106db338701cf4bd1b\" id=\"h-setup-maintenance-and-ops-overhead\" style=\"color:#2b7ca4\">Setup, maintenance, and ops overhead<\/h2>\n\n\n\n<p>This is where the practical difference becomes most visible for smaller teams.<\/p>\n\n\n\n<p>The ALTCHA open-source widget is genuinely easy to integrate: a JavaScript snippet, a backend verification call, and you are done. The challenge starts with Sentinel. Production-grade ALTCHA protection requires deploying and operating a Docker or Kubernetes container, configuring PostgreSQL or Redis for persistence and clustering, managing TLS, setting up monitoring, and handling updates when new versions ship. For a team with existing DevOps infrastructure, this is manageable. For a two-person development team or a public-sector web team without dedicated ops, it is a real ongoing commitment.<\/p>\n\n\n\n<p>CAPTCHA.eu requires no server deployment. You add a JavaScript snippet, configure your API keys, and the integration is complete. WordPress and TYPO3 administrators can install an official plugin without writing any code. Updates, infrastructure scaling, and uptime are handled by CAPTCHA.eu.<\/p>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-nnuk7\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-nnuk7 \"><div class=\"eb-infobox-nnuk7 eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">The honest ops comparison<\/h3><p class=\"description\">If your team already operates Docker or Kubernetes in production and has a DevOps engineer who will own the Sentinel deployment, ALTCHA&#8217;s ops overhead is reasonable. If you do not have that capacity, the ongoing maintenance burden of a self-hosted security component is likely to result in delayed patches and degraded protection over time.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-f27440b970b03a9a46cff659bd1acaa2\" id=\"h-gdpr-and-compliance-documentation\" style=\"color:#2b7ca4\">GDPR and compliance documentation<\/h2>\n\n\n\n<p>Both solutions are designed for GDPR compliance, but the compliance documentation process looks different for each.<\/p>\n\n\n\n<p>With ALTCHA, because you self-host, there is no data processor relationship to document. ALTCHA processes no data on your behalf. This simplifies your Article 30 records: the CAPTCHA component is internal infrastructure, not a third-party processor. For DPOs who prefer minimal third-party relationships, this is a genuine advantage.<\/p>\n\n\n\n<p>With CAPTCHA.eu, you enter into a Data Processing Agreement (DPA) that names Austria as the processing location and bot protection as the purpose. This adds one line to your processor list, but it gives your DPO a documented, verifiable processor relationship rather than an internal self-hosted system they need to audit themselves.<\/p>\n\n\n\n<p>On accessibility, both solutions claim WCAG 2.2 AA compliance. CAPTCHA.eu has this independently certified by T\u00dcV Austria. ALTCHA self-declares compliance. For procurement in public sector, healthcare, or regulated financial contexts, the difference between an independently certified certification and a self-declaration is material. Many procurement frameworks specifically require third-party certification rather than self-attestation.<\/p>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-lux0p\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-lux0p \"><div class=\"eb-infobox-lux0p eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">For public sector and regulated procurement<\/h3><p class=\"description\">If your procurement process requires documented third-party certification for accessibility compliance, CAPTCHA.eu&#8217;s T\u00dcV Austria certificate for WCAG 2.2 AA provides that. ALTCHA&#8217;s self-declaration may not satisfy procurement frameworks that specify independent certification.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-934711d4128a25a3ee3d8f1000d48cf5\" id=\"h-platform-integrations\" style=\"color:#2b7ca4\">Platform integrations<\/h2>\n\n\n\n<p>Integration availability is one of the clearest practical differences between the two solutions, particularly for TYPO3 and Keycloak users.<\/p>\n\n\n\n<p><strong>WordPress:<\/strong>&nbsp;Both have official plugins. ALTCHA launched WordPress V2 in 2026. CAPTCHA.eu has had an official WordPress plugin since earlier in the platform&#8217;s history. Both work.<\/p>\n\n\n\n<p><strong>TYPO3:<\/strong>&nbsp;CAPTCHA.eu has official extensions for both EXT:form and PowerMail. ALTCHA has no TYPO3 extension. For TYPO3 sites (common in DACH public sector and enterprise environments), CAPTCHA.eu is the only option of the two.<\/p>\n\n\n\n<p><strong>Keycloak:<\/strong>&nbsp;CAPTCHA.eu has an official JAR that covers all three authentication flows: login, registration, and password reset, supporting Keycloak 22.0.3 and later. ALTCHA has a community-maintained JAR that covers registration only, and requires a self-hosted Sentinel backend. For IAM teams running Keycloak in production, CAPTCHA.eu&#8217;s broader flow coverage and lower version requirements are a meaningful difference. See our full&nbsp;<a href=\"https:\/\/www.captcha.eu\/keycloak-recaptcha-alternative\/\">Keycloak integration guide<\/a>&nbsp;for setup details.<\/p>\n\n\n\n<p><strong>Other platforms:<\/strong>&nbsp;CAPTCHA.eu provides official integrations for a range of additional platforms including Shopware, Symfony, and others. ALTCHA&#8217;s integration ecosystem is primarily community-driven outside of WordPress.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-1ade8b93acecfe56311d280ef4ec4c52\" id=\"h-cost-comparison\" style=\"color:#2b7ca4\">Cost comparison<\/h2>\n\n\n\n<p>Cost comparison between a self-hosted and a managed solution is more complex than it first appears, because the infrastructure and DevOps costs of self-hosting are real even when the license is free.<\/p>\n\n\n\n<p>The ALTCHA open-source widget is free. ALTCHA Sentinel, which provides the production-grade adaptive protection, requires a paid license. Sentinel pricing starts at \u20ac99\/month for the Professional plan and \u20ac799\/month for Enterprise (monthly billing, as of April 2026; check altcha.org\/docs\/v2\/sentinel\/pricing\/ for current rates). A 30-day free trial is available. Infrastructure costs are not included in the license fee.<\/p>\n\n\n\n<p>Separately, you pay for the infrastructure on which Sentinel runs: a server or container runtime, persistent storage, and any redundancy you configure. For high-availability deployments, this typically means clustering with PostgreSQL, which adds infrastructure complexity and cost. For a team already running Kubernetes, marginal infrastructure cost is low. For a team that has to provision new infrastructure for Sentinel specifically, the cost comparison shifts.<\/p>\n\n\n\n<p>CAPTCHA.eu pricing is usage-based, with a free tier available and paid plans scaling by verified request volume. Infrastructure is included in the price. There are no separate hosting costs, no ops time required, and no version management overhead.<\/p>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-mvxbe\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-mvxbe \"><div class=\"eb-infobox-mvxbe eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">The real cost of self-hosting a security component<\/h3><p class=\"description\">The true cost of ALTCHA Sentinel for a team without existing DevOps infrastructure is not just the license fee. It includes the engineering time to deploy and maintain it, the cost of the infrastructure it runs on, and the risk of delayed security patches if that maintenance slips. For many teams, the total cost of ownership of a managed service is lower, not higher, than a self-hosted alternative that carries ongoing maintenance obligations.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-2f36d65e2d702a14a6e3cf5fbeff6785\" id=\"h-which-one-should-you-choose\" style=\"color:#2b7ca4\">Which one should you choose?<\/h2>\n\n\n\n<div class=\"wp-block-columns has-foreground-color has-text-color has-link-color wp-elements-ea3d72ba9929da0a664330c75f0d81ad is-layout-flex wp-container-core-columns-is-layout-f5f7395f wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column has-border-color has-background is-layout-flow wp-container-core-column-is-layout-02fefbd7 wp-block-column-is-layout-flow\" style=\"border-color:#fcb90069;border-width:2px;border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#fcb90012;padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">\n<p class=\"has-foreground-color has-text-color has-link-color has-normal-font-size wp-elements-517ebb9d33292745a07dafb5e7d50b35\" style=\"margin-top:var(--wp--preset--spacing--20);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);margin-left:var(--wp--preset--spacing--20)\"><strong>Choose ALTCHA if:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-foreground-color has-text-color has-link-color has-extra-small-font-size wp-elements-05c310726132055a75c37efe1f4243ca\">\n<li class=\"has-tiny-font-size\">Your organisation prohibits any third-party data processing, including EU-hosted processors<\/li>\n\n\n\n<li>You have dedicated DevOps capacity and existing Docker or Kubernetes infrastructure to own the Sentinel deployment<\/li>\n\n\n\n<li>Source code transparency and full auditability are non-negotiable requirements<\/li>\n\n\n\n<li>You are building a custom integration and need MIT-licensed code you can modify freely<\/li>\n\n\n\n<li>You want memory-bound PoW (Argon2\/Scrypt in Widget v3) that raises the hardware cost for bot farms specifically<\/li>\n\n\n\n<li class=\"has-tiny-font-size\">You are comfortable with a community-supported integration ecosystem for platforms beyond WordPress<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column has-border-color has-foreground-color has-text-color has-background has-link-color wp-elements-dd29037a972ae0d03680c85c58c852ec is-layout-flow wp-container-core-column-is-layout-334757f1 wp-block-column-is-layout-flow\" style=\"border-color:#0eb36b69;border-width:2px;border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#0eb36b17;padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">\n<p class=\"has-foreground-color has-text-color has-link-color has-normal-font-size wp-elements-8341c6fdf0e748400812e05473aaa1bf\" style=\"margin-top:var(--wp--preset--spacing--20);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);margin-left:var(--wp--preset--spacing--20);padding-top:0;padding-bottom:0\"><strong>Choose CAPTCHA.eu if:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-foreground-color has-text-color has-link-color has-extra-small-font-size wp-elements-6558d850406441d751d8b02f62dd296a\">\n<li class=\"has-tiny-font-size\">You want verified Austria\/EU hosting with zero infrastructure overhead<\/li>\n\n\n\n<li>You need official integrations for TYPO3, Keycloak (all three auth flows), or WordPress<\/li>\n\n\n\n<li>Your DPO or procurement process needs a standard DPA and independently certified WCAG 2.2 AA compliance<\/li>\n\n\n\n<li>You are a smaller team and cannot justify ongoing DevOps time for a security component<\/li>\n\n\n\n<li>You operate in a DACH public sector or regulated environment where reference customers and named certifications matter<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-group has-vivid-cyan-blue-background-color has-background is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:2rem;padding-bottom:2rem\">\n<h2 class=\"wp-block-heading has-text-align-center has-background-color has-text-color has-extra-large-font-size\" id=\"h-try-captcha-eu-free-no-credit-card-no-infrastructure-setup\">Try CAPTCHA.eu free \u2014 no credit card, no infrastructure setup<\/h2>\n\n\n\n<p class=\"has-text-align-center has-background-color has-text-color\">100 free verifications. Austria-hosted. Official plugins for WordPress, TYPO3, and Keycloak. WCAG 2.2 AA certified by T\u00dcV Austria.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-de3b580a wp-block-buttons-is-layout-flex\" style=\"margin-top:3rem\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-body-text-color has-background-background-color has-text-color has-background wp-element-button\" href=\"https:\/\/www.captcha.eu\/login\" target=\"_blank\" rel=\"noreferrer noopener\">Start free trial<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-background-color has-text-color wp-element-button\" href=\"https:\/\/www.captcha.eu\/plugins-and-platforms\/\" target=\"_blank\" rel=\"noreferrer noopener\">See all integrations<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-5ce9e574cfb454ba3d1a1aa741d21fde\" id=\"h-frequently-asked-questions\" style=\"color:#2b7ca4\">Frequently Asked Questions<\/h2>\n\n\n\n<div class=\"wp-block-premium-accordion premium-accordion premium-accordion-e09f0f71fdda\">\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-3919a3de4000 premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Is ALTCHA truly free?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">The open-source widget is free under an MIT license. ALTCHA Sentinel, the self-hosted backend that provides production-grade adaptive protection, threat intelligence, and ML classification, requires a paid license starting at approximately \u20ac29\/month. You also need to provide and maintain the infrastructure it runs on.<\/p><\/div><\/div>\n\n\n\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-1a968e20a77a premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Does ALTCHA store data in the EU?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">ALTCHA is self-hosted, so data resides wherever you deploy it. You choose the location. If you deploy on EU infrastructure, data stays in the EU. If you deploy elsewhere, it does not. The compliance burden of ensuring the right data location sits with you.<\/p><\/div><\/div>\n\n\n\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-69cac6df7cf6 premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Does CAPTCHA.eu have a free tier?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">Yes. CAPTCHA.eu offers 100 free verifications to get started. Paid plans are usage-based and scale with request volume. See the\u00a0<a href=\"https:\/\/www.captcha.eu\/#pricing\">pricing page<\/a>\u00a0for current plan details.<\/p><\/div><\/div>\n\n\n\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-f86cfc2976c1 premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Can ALTCHA protect Keycloak login flows?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">The community ALTCHA Keycloak JAR covers the registration flow only. It also requires a self-hosted Sentinel backend. CAPTCHA.eu&#8217;s official Keycloak plugin covers login, registration, and password reset on Keycloak 22.0.3 and later, without requiring a separate backend deployment. For a full walkthrough, see our\u00a0<a href=\"https:\/\/www.captcha.eu\/keycloak-recaptcha-alternative\/\">Keycloak reCAPTCHA alternative guide<\/a>.<\/p><\/div><\/div>\n\n\n\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-ae390d29a54e premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Which solution is better for GDPR compliance?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">Both are designed for GDPR compliance, but they approach it differently. ALTCHA eliminates a third-party processor relationship because you self-host everything. CAPTCHA.eu provides a documented Data Processing Agreement with Austria-hosted processing. For DPOs who want to minimise third-party processors, ALTCHA&#8217;s model is simpler. For DPOs who want a verifiable, documented processor with a standard DPA, CAPTCHA.eu is the cleaner path.<\/p><\/div><\/div>\n\n\n\n<div class=\"wp-block-premium-accordion-item premium-accordion-item-d630e2483fd7 premium-accordion__content_wrap\"><div class=\"premium-accordion__title_wrap premium-accordion__ltr premium-accordion__out\"><div class=\"premium-accordion__title\"><h4 class=\"premium-accordion__title_text\">Which solution has better accessibility certification?<\/h4><\/div><div class=\"premium-accordion__icon_wrap\"><svg class=\"premium-accordion__icon\" role=\"img\" focusable=\"false\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 20 20\"><polygon points=\"16.7,3.3 10,10 3.3,3.4 0,6.7 10,16.7 10,16.6 20,6.7 \"><\/polygon><\/svg><\/div><\/div><div class=\"premium-accordion__desc_wrap\"><p class=\"premium-accordion__desc\">CAPTCHA.eu holds independent WCAG 2.2 AA certification from T\u00dcV Austria. ALTCHA self-declares WCAG 2.2 AA compliance. For procurement processes that require third-party certification rather than self-attestation (which is common in public sector and regulated environments), CAPTCHA.eu&#8217;s certificate provides documentation that ALTCHA&#8217;s self-declaration does not.<\/p><\/div><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-35238059df35ed9dad481dbef77b1fc7\" id=\"h-related-reading\" style=\"color:#2b7ca4\">Related reading<\/h2>\n\n\n<div class=\"root-eb-post-carousel-2ei7e wp-block-essential-blocks-post-carousel\">\n    <div class=\"eb-parent-wrapper eb-parent-eb-post-carousel-2ei7e \">\n        <div class=\"eb-post-carousel-2ei7e style-2 slick-arrows equal-height dot-style-1 eb-post-carousel-wrapper\"\n            data-id=\"eb-post-carousel-2ei7e\"\n            data-querydata=\"a:13:{s:6:&quot;source&quot;;s:4:&quot;post&quot;;s:11:&quot;sourceIndex&quot;;i:0;s:9:&quot;rest_base&quot;;s:5:&quot;posts&quot;;s:14:&quot;rest_namespace&quot;;s:5:&quot;wp\/v2&quot;;s:6:&quot;author&quot;;s:0:&quot;&quot;;s:10:&quot;taxonomies&quot;;a:0:{}s:8:&quot;per_page&quot;;s:1:&quot;6&quot;;s:6:&quot;offset&quot;;s:1:&quot;0&quot;;s:7:&quot;orderby&quot;;s:4:&quot;date&quot;;s:5:&quot;order&quot;;s:4:&quot;desc&quot;;s:7:&quot;include&quot;;s:357:&quot;[{&quot;value&quot;:3462,&quot;label&quot;:&quot;Best reCAPTCHA Alternatives in Europe (2026)&quot;},{&quot;value&quot;:3672,&quot;label&quot;:&quot;WordPress reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites&quot;},{&quot;value&quot;:3687,&quot;label&quot;:&quot;Keycloak reCAPTCHA Alternative for European Teams (2026)&quot;},{&quot;value&quot;:3680,&quot;label&quot;:&quot;TYPO3 reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites&quot;}]&quot;;s:7:&quot;exclude&quot;;s:0:&quot;&quot;;s:15:&quot;exclude_current&quot;;b:0;}\"\n            data-slidersettings=\"{&quot;arrows&quot;:true,&quot;dots&quot;:true,&quot;autoplaySpeed&quot;:3000,&quot;speed&quot;:500,&quot;adaptiveHeight&quot;:true,&quot;autoplay&quot;:true,&quot;infinite&quot;:true,&quot;pauseOnHover&quot;:true,&quot;slideToShowRange&quot;:3,&quot;leftArrowIcon&quot;:&quot;fas fa-chevron-circle-left&quot;,&quot;rightArrowIcon&quot;:&quot;fas fa-chevron-circle-right&quot;,&quot;addIcon&quot;:false,&quot;showFallbackImg&quot;:false,&quot;fallbackImgUrl&quot;:&quot;&quot;,&quot;TABslideToShowRange&quot;:2,&quot;MOBslideToShowRange&quot;:1}\"\n            data-attributes=\"{&quot;preset&quot;:&quot;style-2&quot;,&quot;showThumbnail&quot;:true,&quot;showTitle&quot;:true,&quot;titleLength&quot;:&quot;10&quot;,&quot;titleTag&quot;:&quot;h2&quot;,&quot;showContent&quot;:true,&quot;contentLength&quot;:20,&quot;expansionIndicator&quot;:&quot;...&quot;,&quot;showReadMore&quot;:true,&quot;readmoreText&quot;:&quot;Read More&quot;,&quot;showMeta&quot;:true,&quot;headerMeta&quot;:&quot;[]&quot;,&quot;footerMeta&quot;:&quot;[]&quot;,&quot;authorPrefix&quot;:&quot;by&quot;,&quot;datePrefix&quot;:&quot;&quot;,&quot;showBlockContent&quot;:true,&quot;leftArrowIcon&quot;:&quot;fas fa-chevron-circle-left&quot;,&quot;rightArrowIcon&quot;:&quot;fas fa-chevron-circle-right&quot;,&quot;showFallbackImg&quot;:false}\">\n\n            <div class=\"eb-post-carousel init-eb-post-carousel-2ei7e\"\n                data-id=\"eb-post-carousel-2ei7e\">\n                <article class=\"ebpg-carousel-post ebpg-post-carousel-column\" data-id=\"3687\"><div class=\"ebpg-carousel-post-holder\"><div class=\"ebpg-entry-media\">\n                <div class=\"ebpg-entry-thumbnail\">\n                    <a class=\"ebpg-post-link-wrapper eb-sr-only\" href=\"https:\/\/www.captcha.eu\/fr\/keycloak-recaptcha-alternative\/\">Keycloak reCAPTCHA Alternative for European Teams (2026)<\/a>\n                    <img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1080\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-5.jpg\" class=\"attachment-full size-full not-transparent\" alt=\"Keycloak reCAPTCHA alternative illustration for European teams, showing an \u201cI\u2019m not a robot\u201d checkbox replaced by a .eu user verification system with a security shield, EU flag, and European country icons.\" data-has-transparency=\"false\" data-dominant-color=\"d8e5f3\" style=\"--dominant-color: #d8e5f3\" \/>\n                <\/div>\n            <\/div><div class=\"ebpg-entry-wrapper\"><div class=\"ebpg-entry-meta ebpg-header-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><header class=\"ebpg-entry-header\">\n            <h2 class=\"ebpg-entry-title\">\n                <a class=\"ebpg-carousel-post-link\" href=\"https:\/\/www.captcha.eu\/fr\/keycloak-recaptcha-alternative\/\" title=\"Keycloak reCAPTCHA Alternative for European Teams (2026)\">Keycloak reCAPTCHA Alternative for European Teams (2026)<\/a>\n            <\/h2>\n        <\/header><div class=\"ebpg-entry-content\"><div class=\"ebpg-carousel-post-excerpt\">\n            <p>Keycloak ships with reCAPTCHA built into its registration flow. For European organisations, that default creates cookies, US data transfers, and&#8230;<\/p>\n        <\/div><div class=\"ebpg-readmore-btn\">\n            <a href=\"https:\/\/www.captcha.eu\/fr\/keycloak-recaptcha-alternative\/\"> Read More <\/a>\n        <\/div><\/div><div class=\"ebpg-entry-meta ebpg-footer-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><\/div><\/div><\/article><article class=\"ebpg-carousel-post ebpg-post-carousel-column\" data-id=\"3680\"><div class=\"ebpg-carousel-post-holder\"><div class=\"ebpg-entry-media\">\n                <div class=\"ebpg-entry-thumbnail\">\n                    <a class=\"ebpg-post-link-wrapper eb-sr-only\" href=\"https:\/\/www.captcha.eu\/fr\/typo3-recaptcha-alternative\/\">TYPO3 reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites<\/a>\n                    <img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1080\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-4.jpg\" class=\"attachment-full size-full not-transparent\" alt=\"TYPO3 reCAPTCHA alternative illustration for European websites, showing an \u201cI\u2019m not a robot\u201d checkbox replaced by a .eu user verification system with a security shield and EU flag.\" data-has-transparency=\"false\" data-dominant-color=\"d2e1f0\" style=\"--dominant-color: #d2e1f0\" \/>\n                <\/div>\n            <\/div><div class=\"ebpg-entry-wrapper\"><div class=\"ebpg-entry-meta ebpg-header-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><header class=\"ebpg-entry-header\">\n            <h2 class=\"ebpg-entry-title\">\n                <a class=\"ebpg-carousel-post-link\" href=\"https:\/\/www.captcha.eu\/fr\/typo3-recaptcha-alternative\/\" title=\"TYPO3 reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites\">TYPO3 reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites<\/a>\n            <\/h2>\n        <\/header><div class=\"ebpg-entry-content\"><div class=\"ebpg-carousel-post-excerpt\">\n            <p>reCAPTCHA on TYPO3 means cookies, US data transfers and a growing compliance burden that most DACH teams no longer want&#8230;<\/p>\n        <\/div><div class=\"ebpg-readmore-btn\">\n            <a href=\"https:\/\/www.captcha.eu\/fr\/typo3-recaptcha-alternative\/\"> Read More <\/a>\n        <\/div><\/div><div class=\"ebpg-entry-meta ebpg-footer-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><\/div><\/div><\/article><article class=\"ebpg-carousel-post ebpg-post-carousel-column\" data-id=\"3672\"><div class=\"ebpg-carousel-post-holder\"><div class=\"ebpg-entry-media\">\n                <div class=\"ebpg-entry-thumbnail\">\n                    <a class=\"ebpg-post-link-wrapper eb-sr-only\" href=\"https:\/\/www.captcha.eu\/fr\/wordpress-recaptcha-alternative\/\">WordPress reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites<\/a>\n                    <img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1080\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/04\/Captcha.eu-3.jpg\" class=\"attachment-full size-full not-transparent\" alt=\"Illustration of a WordPress reCAPTCHA alternative for European websites, showing an \u201cI\u2019m not a robot\u201d checkbox replaced by a .eu user verification system with a security shield and EU flag.\" data-has-transparency=\"false\" data-dominant-color=\"d4e3f1\" style=\"--dominant-color: #d4e3f1\" \/>\n                <\/div>\n            <\/div><div class=\"ebpg-entry-wrapper\"><div class=\"ebpg-entry-meta ebpg-header-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><header class=\"ebpg-entry-header\">\n            <h2 class=\"ebpg-entry-title\">\n                <a class=\"ebpg-carousel-post-link\" href=\"https:\/\/www.captcha.eu\/fr\/wordpress-recaptcha-alternative\/\" title=\"WordPress reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites\">WordPress reCAPTCHA Alternative: How to Replace reCAPTCHA on European Websites<\/a>\n            <\/h2>\n        <\/header><div class=\"ebpg-entry-content\"><div class=\"ebpg-carousel-post-excerpt\">\n            <p>Google reCAPTCHA works on WordPress. But when you look at what it means for GDPR, cookies, and US data transfers,&#8230;<\/p>\n        <\/div><div class=\"ebpg-readmore-btn\">\n            <a href=\"https:\/\/www.captcha.eu\/fr\/wordpress-recaptcha-alternative\/\"> Read More <\/a>\n        <\/div><\/div><div class=\"ebpg-entry-meta ebpg-footer-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><\/div><\/div><\/article><article class=\"ebpg-carousel-post ebpg-post-carousel-column\" data-id=\"3462\"><div class=\"ebpg-carousel-post-holder\"><div class=\"ebpg-entry-media\">\n                <div class=\"ebpg-entry-thumbnail\">\n                    <a class=\"ebpg-post-link-wrapper eb-sr-only\" href=\"https:\/\/www.captcha.eu\/fr\/meilleures-alternatives-a-recaptcha-en-europe\/\">Best reCAPTCHA Alternatives in Europe (2026)<\/a>\n                    <img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1080\" src=\"https:\/\/www.captcha.eu\/wp-content\/uploads\/2026\/03\/Design-ohne-Titel-7.jpg\" class=\"attachment-full size-full not-transparent\" alt=\"A clean blue-and-white illustration of a laptop showing a CAPTCHA comparison dashboard for Europe. On the left is a generic \u201cI\u2019m not a robot\u201d checkbox, and on the right are three feature cards labeled user friendly, hosted in Europe, and privacy focused. Around the laptop are icons for EU compliance, accessibility, privacy, and cookie-free browsing, with a faint map of Europe and EU stars in the background.\" data-has-transparency=\"false\" data-dominant-color=\"d5e0ed\" style=\"--dominant-color: #d5e0ed\" \/>\n                <\/div>\n            <\/div><div class=\"ebpg-entry-wrapper\"><div class=\"ebpg-entry-meta ebpg-header-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><header class=\"ebpg-entry-header\">\n            <h2 class=\"ebpg-entry-title\">\n                <a class=\"ebpg-carousel-post-link\" href=\"https:\/\/www.captcha.eu\/fr\/meilleures-alternatives-a-recaptcha-en-europe\/\" title=\"Best reCAPTCHA Alternatives in Europe (2026)\">Best reCAPTCHA Alternatives in Europe (2026)<\/a>\n            <\/h2>\n        <\/header><div class=\"ebpg-entry-content\"><div class=\"ebpg-carousel-post-excerpt\">\n            <p>Google&#8217;s April 2026 change makes reCAPTCHA a live compliance decision for every European website. This guide cuts through the noise:&#8230;<\/p>\n        <\/div><div class=\"ebpg-readmore-btn\">\n            <a href=\"https:\/\/www.captcha.eu\/fr\/meilleures-alternatives-a-recaptcha-en-europe\/\"> Read More <\/a>\n        <\/div><\/div><div class=\"ebpg-entry-meta ebpg-footer-meta\"><div class=\"ebpg-entry-meta-items\"><\/div><\/div><\/div><\/div><\/article>            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-essential-blocks-infobox  root-eb-infobox-voxix\"><div class=\"eb-parent-wrapper eb-parent-eb-infobox-voxix \"><div class=\"eb-infobox-voxix eb-infobox-wrapper\"><div class=\"infobox-wrapper-inner\"><div class=\"contents-wrapper\"><h3 class=\"title\">Primary sources<\/h3><p class=\"description\"><a href=\"https:\/\/altcha.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">ALTCHA.org<\/a>: official product documentation, feature descriptions, and open-source licensing information<br><a href=\"https:\/\/altcha.org\/docs\/v2\/sentinel\/\" target=\"_blank\" rel=\"noreferrer noopener\">ALTCHA Sentinel documentation<\/a>: Sentinel features, deployment requirements, and pricing tiers<br><a href=\"https:\/\/github.com\/altcha-org\/altcha\" target=\"_blank\" rel=\"noreferrer noopener\">ALTCHA on GitHub<\/a>: open-source widget under MIT license<br><a href=\"https:\/\/altcha.org\/docs\/v2\/compliance\/wcag\" target=\"_blank\" rel=\"noreferrer noopener\">ALTCHA WCAG compliance documentation<\/a>: self-declared WCAG 2.2 AA compliance<br><a href=\"https:\/\/www.captcha.eu\/captcha-plugin-for-keycloak\/\" target=\"_blank\" rel=\"noreferrer noopener\">CAPTCHA.eu Keycloak plugin documentation<\/a>: official JAR covering login, registration, and password reset<br><a href=\"https:\/\/www.captcha.eu\/captcha-eu-achieves-waca-silver-certification-setting-new-standards-in-accessible-digital-security\/\" target=\"_blank\" rel=\"noreferrer noopener\">CAPTCHA.eu T\u00dcV Austria WCAG 2.2 AA certification<\/a><br>Pricing information verified from public documentation as of April 2026. Prices subject to change; check current pages before purchasing.<\/p><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-vivid-cyan-blue-background-color has-background is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:5rem;padding-bottom:5rem\">\n<h2 class=\"wp-block-heading has-text-align-center has-background-color has-text-color has-extra-large-font-size\" id=\"h-use-the-migration-moment-to-simplify-your-stack\">Use the migration moment to simplify your stack<\/h2>\n\n\n\n<p class=\"has-text-align-center has-background-color has-text-color\">Google&#8217;s migration forces many teams to review reCAPTCHA anyway. If you would rather use that effort to move to an EU-hosted, no-cookie alternative with direct integration paths and T\u00dcV-certified accessibility, start with captcha.eu. 100 free requests, no credit card required.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-de3b580a wp-block-buttons-is-layout-flex\" style=\"margin-top:3rem\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-body-text-color has-background-background-color has-text-color has-background wp-element-button\" href=\"https:\/\/www.captcha.eu\/login\">Start free trial<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-outline is-style-outline--2\"><a class=\"wp-block-button__link has-background-color has-text-color wp-element-button\" href=\"https:\/\/www.captcha.eu\/contact-us\/\">Contact sales<\/a><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>ALTCHA and CAPTCHA.eu solve the same problem: bot protection without cookies or reCAPTCHA&#8217;s privacy overhead, but they do it in fundamentally different ways. ALTCHA is open-source and self-hosted. CAPTCHA.eu is a managed, EU-hosted service. The right choice depends on how much infrastructure your team wants to own and what your [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3740,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-3738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-blog"],"acf":{"pretitle":"","intern_slug":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ALTCHA vs CAPTCHA.eu: Open Source or Managed CAPTCHA? - captcha.eu<\/title>\n<meta name=\"description\" content=\"Self-hosted open source or EU managed Captcha service? 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