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ALTCHA

GDPR compliant, self-hosted CAPTCHA alternative.
README.md

ALTCHA

ALTCHA is free, open-source CAPTCHA alternative that protects your website from spam and abuse.

It uses a proof-of-work mechanism to protect your website, APIs, and online services from spam and unwanted content. Unlike other CAPTCHA solutions, ALTCHA is free, open-source and self-hosted, does not use cookies nor fingerprinting, does not track users, and is fully compliant with GDPR.

Get Started

Refer to the documentation.

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  1. altcha altcha Public

    GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.

    JavaScript 2.1k 98

  2. altcha-lib altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 75 13

  3. altcha-wordpress-next altcha-wordpress-next Public

    ALTCHA for WordPress v2 is the professional solution for keeping your website safe from spam, bots, and abuse.

    PHP 13 5

Repositories

Showing 10 of 40 repositories
  • altcha Public

    GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.

    altcha-org/altcha’s past year of commit activity
    JavaScript 2,065 MIT 98 0 0 Updated Mar 12, 2026
  • helm-charts Public
    altcha-org/helm-charts’s past year of commit activity
    Go Template 2 3 0 0 Updated Mar 7, 2026
  • sentinel-install-scripts Public
    altcha-org/sentinel-install-scripts’s past year of commit activity
    Shell 1 0 0 0 Updated Mar 7, 2026
  • altcha-sentinel-deploy-azure Public
    altcha-org/altcha-sentinel-deploy-azure’s past year of commit activity
    0 0 0 0 Updated Mar 7, 2026
  • altcha-sentinel-deploy-aws Public
    altcha-org/altcha-sentinel-deploy-aws’s past year of commit activity
    0 0 0 0 Updated Mar 7, 2026
  • altcha-lib-php Public

    A lightweight PHP library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-php’s past year of commit activity
    PHP 76 MIT 8 1 0 Updated Feb 28, 2026
  • altcha-flutter Public

    ALTCHA Flutter widget

    altcha-org/altcha-flutter’s past year of commit activity
    Dart 2 MIT 7 0 0 Updated Feb 28, 2026
  • altcha-wordpress-next Public

    ALTCHA for WordPress v2 is the professional solution for keeping your website safe from spam, bots, and abuse.

    altcha-org/altcha-wordpress-next’s past year of commit activity
    PHP 13 5 1 0 Updated Feb 27, 2026
  • pow-v2-cpp-solver Public
    altcha-org/pow-v2-cpp-solver’s past year of commit activity
    C++ 0 MIT 0 0 0 Updated Feb 21, 2026
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib’s past year of commit activity
    TypeScript 75 MIT 13 0 0 Updated Feb 4, 2026
View all repositories

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