Open Source reCAPTCHA AlternativesTop Anti-Spam Tools and other similar apps like reCAPTCHA

The best open source alternative to reCAPTCHA is Cap Captcha. If that doesn't suit you, our users have ranked more than 25 alternatives to reCAPTCHA and eight of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to reCAPTCHA are mosparo, ALTCHA, mCaptcha and Procaptcha.

reCAPTCHA iconreCAPTCHA
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reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and...

More about reCAPTCHA
More about reCAPTCHA
reCAPTCHA alternatives page was last updated Apr 12, 2025
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Alternatives
  1. Cap Captcha icon

    Cap Captcha

     12 likes
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    Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.

    27 Cap Captcha alternatives

    License model

    • Free • Open Source

    Application type

    Country of Origin

    • PT flagPortugal
    • European Union flagEU

    Platforms

    • Self-Hosted
    • Docker
    Cap Captcha screenshot 1

    Properties

    1.  Lightweight
    2.  Privacy focused
    3.  Customizable

    Features

    1.  No Tracking
    2.  Spam Filter
    3.  Dark Mode
    4.  Ad-free
    5.  Captcha

    Cap Captcha VS reCAPTCHA

     

    • Cap Captcha is the most popular Self-Hosted alternative to reCAPTCHA.

    • Cap Captcha is the most popular Open Source & free alternative to reCAPTCHA.

    • Cap Captcha is Free and Open SourcereCAPTCHA is Freemium and Proprietary
    • Cap Captcha is Lightweight and Privacy focusedreCAPTCHA is not according to our users
  2. mosparo icon

    mosparo

     4 likes
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    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.

    22 mosparo alternatives

    License model

    • Free • Open Source

    Application type

    Country of Origin

    • CH flagSwitzerland

    Platforms

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

    Properties

    1.  Privacy focused

    Features

    1.  Spam Filter
    2.  Self-hosted
    3. WordPress icon  WordPress Integration
    4. Drupal icon  Drupal Integration

    mosparo VS reCAPTCHA

     
  4. ALTCHA icon

    ALTCHA

     5 likes
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    ALTCHA 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...

    15 ALTCHA alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Software as a Service (SaaS)
    Simple automatic user verification

    Properties

    1.  Privacy focused

    Features

    1.  Spam Filter
    2.  GDPR Compliant
    3.  Captcha
    4.  Integrated Spam Protection

    ALTCHA VS reCAPTCHA

     
  5. mCaptcha icon

    mCaptcha

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

    27 mCaptcha alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    mCaptcha screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Ad-free
    2.  Captcha
    3.  Rust

    mCaptcha VS reCAPTCHA

     
    Comments about mCaptcha as an Alternative to reCAPTCHA
    Biep
    Positive •Mar 10, 2025
    0

    It is Free and Open Source. Inspectable.

    reCAPTCHA Icon
    mCaptcha icon
    • mCaptcha is Free and Open SourcereCAPTCHA is Freemium and Proprietary
    • mCaptcha is Privacy focusedreCAPTCHA is not according to our users
  6. Procaptcha icon

    Procaptcha

     8 likes
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    Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy, security, and decentralization. It's a pioneering solution designed to offer an alternative to conventional, centralized CAPTCHA systems that often compromise user privacy.

    20 Procaptcha alternatives

    License model

    • Freemium • Open Source

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    Procaptcha screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Bot detection
    2.  Captcha
    3.  Spam Filter
    4.  Ad-free
    5.  Integrated Spam Protection

    Procaptcha VS reCAPTCHA

     
    Comments about Procaptcha as an Alternative to reCAPTCHA
    Peter Jepef
    Positive •Sep 6, 2024
    0

    It works better, it costs less, it doesn't track your users, it has invisible challenges for humans stops bots. Need I say more?

    reCAPTCHA Icon
    Procaptcha icon
    • Procaptcha is Freemium and Open SourcereCAPTCHA is Freemium and Proprietary
    • Procaptcha is Privacy focusedreCAPTCHA is not according to our users
  7. IconCaptcha icon

    IconCaptcha

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    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.

    18 IconCaptcha alternatives

    License model

    • Free • Open Source

    Platforms

    • Self-Hosted
    IconCaptcha screenshot 1

    Properties

    1.  User friendly

    Features

    1.  Bots
    2.  Captcha

    IconCaptcha VS reCAPTCHA

     

  9. EU Captcha

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    Multilingual captcha developed by and for EU countries.

    21 EU Captcha alternatives

    License model

    • Free • Open Source

    Platforms

    • Self-Hosted

    EU Captcha Features

    1.  Spam Filter
    2.  European data privacy
    3.  Captcha

    EU Captcha VS reCAPTCHA

     
  10. Captcheck icon

    Captcheck

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    Open source reCAPTCHA alternative.

    17 Captcheck alternatives

    License model

    • Free • Open Source

    Platforms

    • Online
    • Self-Hosted
    Image mode

    Captcheck Features

    1.  Captcha Recognition

    Captcheck VS reCAPTCHA

     
8 of 8 reCAPTCHA alternatives