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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 and advanced anti-spam filter.

    JavaScript 1.3k 53

  2. altcha-lib altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 56 10

  3. wordpress-plugin wordpress-plugin Public

    ALTCHA for WordPress plugin

    PHP 32 5

Repositories

Showing 10 of 33 repositories
  • helm-charts Public
    altcha-org/helm-charts’s past year of commit activity
    Smarty 0 0 0 0 Updated Jul 2, 2025
  • altcha-sentinel-deploy-azure Public
    altcha-org/altcha-sentinel-deploy-azure’s past year of commit activity
    0 0 0 0 Updated Jul 2, 2025
  • altcha-sentinel-deploy-aws Public
    altcha-org/altcha-sentinel-deploy-aws’s past year of commit activity
    0 0 0 0 Updated Jul 2, 2025
  • altcha Public

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

    altcha-org/altcha’s past year of commit activity
    JavaScript 1,308 MIT 53 1 0 Updated Jul 1, 2025
  • wordpress-plugin Public

    ALTCHA for WordPress plugin

    altcha-org/wordpress-plugin’s past year of commit activity
    PHP 32 GPL-2.0 5 3 0 Updated Jun 23, 2025
  • 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 11 MIT 1 1 0 Updated Jun 22, 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 14 MIT 5 1 0 Updated Jun 7, 2025
  • altcha-lib-java Public

    A lightweight Java library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib-java’s past year of commit activity
    Java 4 MIT 1 0 0 Updated Jun 7, 2025
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib’s past year of commit activity
    TypeScript 56 MIT 10 0 0 Updated Jun 7, 2025
  • altcha-starter-csp Public
    altcha-org/altcha-starter-csp’s past year of commit activity
    CSS 0 0 0 0 Updated May 28, 2025
View all repositories

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