cap-captcha

cap-captcha

A web-based tool for creating and validating Common Alerting Protocol files

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last commit 2026-03-02
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Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges.

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  • Ultra Lightweight
    Core

    About 250x smaller than hCaptcha (~20kb) with zero dependencies

  • Privacy-First
    Core

    No telemetry sent to external servers

  • Fully Customizable

    Customize colors, size, position, and icons with CSS variables

  • Proof-of-Work

    Verifies users without visual puzzles

  • Standalone Mode

    Run anywhere using Docker

  • Programmatic

    Solve challenges in the background

  • M2M Support

    Protect APIs while allowing trusted bots

  • Open Source
    Core

    Free and open-source under Apache 2.0

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slug: cap-captcha