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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 Public

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

    JavaScript 726 29

  2. altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 43 8

  3. wordpress-plugin Public

    ALTCHA for WordPress plugin

    PHP 26 3

Repositories

Showing 10 of 29 repositories
  • altcha-lib-php Public

    A lightweight PHP library for creating and verifying ALTCHA challenges.

    PHP 23 MIT 3 0 1 Updated Mar 16, 2025
  • altcha Public

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

    JavaScript 726 MIT 29 3 0 Updated Mar 16, 2025
  • altcha-lib-go Public

    A Go library for creating and verifying ALTCHA challenges.

    Go 9 MIT 0 0 0 Updated Mar 10, 2025
  • wordpress-plugin Public

    ALTCHA for WordPress plugin

    PHP 26 GPL-2.0 3 2 0 Updated Feb 28, 2025
  • altcha-starter-py Public
    Python 0 0 0 0 Updated Feb 28, 2025
  • altcha-lib-py Public

    A lightweight Python library for creating and verifying ALTCHA challenges.

    Python 8 MIT 5 3 0 Updated Jan 19, 2025
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 43 MIT 8 0 0 Updated Dec 21, 2024
  • tutorials Public

    ALTCHA Tutorials

    Astro 1 0 0 0 Updated Dec 14, 2024
  • firebase-app-check Public
    TypeScript 1 MIT 0 0 0 Updated Oct 21, 2024
  • firebase-app-check-provider Public
    TypeScript 0 0 0 0 Updated Oct 21, 2024
View all repositories

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