Open Source Self-Hosted reCAPTCHA Alternatives

reCAPTCHA is not available as a self-hosted solution but there are some alternatives for power users and business that want to host a solution on-premise. The best open source Self-Hosted alternative is Cap Captcha. If that doesn't suit you, our users have ranked more than 25 alternatives to reCAPTCHA and eight of them are open source and available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting open source Self-Hosted alternatives to reCAPTCHA are Anubis, ALTCHA, mosparo and mCaptcha.

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Alternatives list

  1. Cap Captcha icon

    Cap Captcha

     25 likes

    Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work and JS instrumentation

    33 Cap Captcha alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Docker
    Cap Captcha screenshot 1
     
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  2. Anubis icon

    Anubis

     17 likes

    Applies sha256 proof-of-work challenges to incoming HTTP requests, targeting AI crawlers, bots that ignore robots.txt, and automated scrapers, protecting server resources and preventing unwanted search engine indexing for privacy-focused sites.

    49 Anubis alternatives

    Cost / License

    • Free Personal
    • Open Source (MIT)

    Application types

    Platforms

    • Self-Hosted
    • Go (Programming Language)
    • Docker
    Anubis screenshot 1
     
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    1
  4. ALTCHA icon

    ALTCHA

     8 likes

    ALTCHA is a privacy-first solution built to help developers and website owners stop bots, spam, and automated abuse — without making things harder for real users. It replaces traditional CAPTCHA systems with a smarter, quieter approach to verification and threat detection.

    20 ALTCHA alternatives

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Self-Hosted
    • Software as a Service (SaaS)
    ALTCHA Sentinel - Self-hosted spam protection for websites, apps, and services.
     
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    1
  5. mosparo icon

    mosparo

     5 likes

    mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Python
    • JavaScript
    • Drupal
    • Django
    • PHP
    • Mautic
    • Wordpress
    A screenshot from the software mosparo with the empty project list.
     
  6. mCaptcha icon

    mCaptcha

     4 likes

    A no-nonsense CAPTCHA system with seamless UX | Backend component.

    Cost / License

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    mCaptcha screenshot 1
     
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    1
  7. IconCaptcha icon

    IconCaptcha

     Like

    conCaptcha is a self-hosted captcha which is faster, more user-friendly and more customizable than other captchas - available for PHP and ASP.NET websites. Users no longer have to read any annoying text images, solve difficult math equations or play any puzzle games.

    21 IconCaptcha alternatives

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Self-Hosted
    IconCaptcha screenshot 1
     
  9. EU Captcha icon

    EU Captcha

     Like

    Multilingual captcha developed by and for EU countries.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Self-Hosted
     
  10. Captcheck icon

    Captcheck

     Like

    Open source reCAPTCHA alternative.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online
    • Self-Hosted
    Image mode
     
8 of 8 reCAPTCHA alternatives