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Top Open Source CAPTCHA & Bot Protection Tools in 2026

A curated collection of the 6 best free and open-source CAPTCHA & Bot Protection tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • Private Captcha

    GDPR-compliant CAPTCHA without legal overhead

    Stars
    187
    Last commit
    11d ago
    License
    Open Source

  • Procaptcha

    GDPR-compliant bot and agent trust management

    Stars
    298
    Last commit
    11d ago
    License
    Apache-2.0

  • mCaptcha

    Privacy-focused proof-of-work captcha system

    Stars
    2,486
    Last commit
    11mo ago
    License
    AGPL-3.0

  • Friendly Captcha

    Privacy-first bot protection without CAPTCHAs

    Stars
    32
    Last commit
    11d ago
    License
    MPL-2.0

  • Cap

    Privacy-first self-hosted CAPTCHA alternative

    Stars
    7,612
    Last commit
    23d ago
    License
    Open Source

  • ALTCHA

    Self-hosted, privacy-friendly CAPTCHA alternative with proof-of-work mechanism

    Stars
    2,710
    Last commit
    19d ago
    License
    MIT
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Showing 6 of 6 open-source tools