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@altcha-org

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.

    TypeScript 2.8k 137

  2. altcha-lib altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 105 15

  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 23 3

Repositories

Showing 10 of 42 repositories
  • altcha-django Public

    Official Django integration for ALTCHA — Widget v3, Proof-of-Work v2, and self-hosted Sentinel.

    altcha-org/altcha-django's past year of commit activity
    Python 3 MIT 0 0 0 Updated Oct 5, 2026
  • altcha-flutter Public

    ALTCHA Flutter widget

    altcha-org/altcha-flutter's past year of commit activity
    Dart 7 MIT 9 0 0 Updated Oct 5, 2026
  • 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
    TypeScript 2,799 MIT 137 0 0 Updated Oct 5, 2026
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib's past year of commit activity
    TypeScript 105 MIT 15 0 0 Updated Oct 5, 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 114 MIT 12 0 0 Updated Oct 4, 2026
  • altcha-lib-rs Public
    altcha-org/altcha-lib-rs's past year of commit activity
    Rust 9 MIT 1 0 0 Updated Oct 4, 2026
  • altcha-lib-rb Public

    A lightweight library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-rb's past year of commit activity
    Ruby 16 MIT 1 0 0 Updated Oct 4, 2026
  • altcha-lib-py Public

    A lightweight Python library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-py's past year of commit activity
    Python 33 MIT 8 0 0 Updated Oct 4, 2026
  • altcha-lib-ex Public

    A lightweight Elixir library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-ex's past year of commit activity
    Elixir 14 MIT 5 0 0 Updated Oct 3, 2026
  • altcha-lib-dotnet Public

    A .NET Library library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-dotnet's past year of commit activity
    C# 1 MIT 0 0 0 Updated Oct 3, 2026
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