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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.

    JavaScript 1.8k 86

  2. altcha-lib altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    TypeScript 66 14

  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 6 2

Repositories

Showing 10 of 39 repositories
  • altcha-starter-react-ts Public
    altcha-org/altcha-starter-react-ts’s past year of commit activity
    TypeScript 4 4 0 0 Updated Dec 4, 2025
  • altcha-starter-angular Public
    altcha-org/altcha-starter-angular’s past year of commit activity
    HTML 1 0 0 0 Updated Dec 3, 2025
  • 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 6 2 0 0 Updated Dec 3, 2025
  • tracker Public

    JavaScript client for ALTCHA Analytics.

    altcha-org/tracker’s past year of commit activity
    TypeScript 2 MIT 1 0 0 Updated Dec 2, 2025
  • altcha-crypto Public
    altcha-org/altcha-crypto’s past year of commit activity
    TypeScript 0 MIT 1 0 0 Updated Dec 2, 2025
  • altcha-lib Public

    A JavaScript library for creating and verifying ALTCHA challenges.

    altcha-org/altcha-lib’s past year of commit activity
    TypeScript 66 MIT 14 0 0 Updated Dec 1, 2025
  • altcha-starter-vue-ts Public
    altcha-org/altcha-starter-vue-ts’s past year of commit activity
    Vue 7 1 0 0 Updated Nov 28, 2025
  • altcha-starter-csp Public
    altcha-org/altcha-starter-csp’s past year of commit activity
    CSS 1 2 0 0 Updated Nov 28, 2025
  • altcha-starter-svelte-ts Public
    altcha-org/altcha-starter-svelte-ts’s past year of commit activity
    Svelte 5 1 0 0 Updated Nov 28, 2025
  • altcha-starter-solid-ts Public
    altcha-org/altcha-starter-solid-ts’s past year of commit activity
    TypeScript 1 0 0 0 Updated Nov 28, 2025
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