altcha-org/altcha

核心功能

• 01Background proof-of-work challenge that avoids visual puzzles.
• 02Cookie-free and fingerprint-free, with no tracking.
• 03Argon2id and Scrypt algorithms that resist ASIC and GPU acceleration.
• 04Image code-challenge fallback with audio support.
• 05Multiple display modes and themes for the widget.
• 06Server libraries in many languages and framework starter templates.

适用场景

• Protecting contact, signup and login forms from spam bots without tracking users.
• Adding bot and abuse protection to APIs or comment systems while meeting GDPR and accessibility requirements.
• Running a fully self-hosted anti-spam layer with no dependency on third-party CAPTCHA services.

标签

常见问题

altcha 是什么？

Self-hosted, cookie-free CAPTCHA alternative that uses a proof-of-work challenge to block spam and bots, with WCAG 2.2 AA accessibility.

altcha 可以免费使用吗？用的什么许可证？

altcha 以 MIT 许可证开源。用于商业产品前，请先确认许可证条款。

altcha 还在维护吗？

活跃维护中。altcha 最近一次提交是在 2026年10月19日。

altcha 适合用来做什么？

Protecting contact, signup and login forms from spam bots without tracking users. Adding bot and abuse protection to APIs or comment systems while meeting GDPR and accessibility requirements. Running a fully self-hosted anti-spam layer with no dependency on third-party CAPTCHA services.

在哪里获取 altcha？

源代码和安装说明在 GitHub 上：https://github.com/altcha-org/altcha