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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 compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter.

    JavaScript 704 28

  2. altcha-lib altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 43 8

  3. wordpress-plugin wordpress-plugin Public

    ALTCHA for WordPress plugin

    PHP 25 3

Repositories

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

    A Go library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-go’s past year of commit activity
    Go 8 MIT 0 0 0 Updated Mar 10, 2025
  • altcha Public

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

    altcha-org/altcha’s past year of commit activity
    JavaScript 704 MIT 28 2 0 Updated Mar 10, 2025
  • 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 21 MIT 2 1 1 Updated Mar 10, 2025
  • wordpress-plugin Public

    ALTCHA for WordPress plugin

    altcha-org/wordpress-plugin’s past year of commit activity
    PHP 25 GPL-2.0 3 2 0 Updated Feb 28, 2025
  • altcha-starter-py Public
    altcha-org/altcha-starter-py’s past year of commit activity
    Python 0 0 0 0 Updated Feb 28, 2025
  • 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 8 MIT 5 3 0 Updated Jan 19, 2025
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib’s past year of commit activity
    TypeScript 43 MIT 8 0 0 Updated Dec 21, 2024
  • tutorials Public

    ALTCHA Tutorials

    altcha-org/tutorials’s past year of commit activity
    Astro 1 0 0 0 Updated Dec 14, 2024
  • firebase-app-check Public
    altcha-org/firebase-app-check’s past year of commit activity
    TypeScript 1 MIT 0 0 0 Updated Oct 21, 2024
  • firebase-app-check-provider Public
    altcha-org/firebase-app-check-provider’s past year of commit activity
    TypeScript 0 0 0 0 Updated Oct 21, 2024
View all repositories

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