ALTCHA
ALTCHA
https://altcha.org/
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter.
From README file:
ALTCHA is a self-hosted, privacy-first security solution that protects your websites, APIs, and online services from spam and abuse through an innovative proof-of-work mechanism. Unlike traditional CAPTCHAs that depend on intrusive methods like cookies or fingerprinting, ALTCHA delivers robust protection while respecting user privacy.
ALTCHA is fully compliant with:
- Global privacy regulations: GDPR, HIPAA, CCPA, PIPEDA/CPPA, LGPD, DPDPA, and PIPL
- Accessibility standards: WCAG 2.2 AA-level and the European Accessibility Act
Download
https://github.com/altcha-org/altcha/archive/refs/tags/v2.1.0.tar.gz
VCS Checkout
git clone https://github.com/altcha-org/altchaCategories
Licensing
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ksiewicz
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25 July 2025
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.
The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.