Alternatives to reCAPTCHA for all platforms with Open Source License

  • visualCaptcha

    A configurable captcha solution, focusing on accessibility & simplicity whilst maintaining security.

    Free Open Source Self-Hosted GitHub

    Mobile friendly Add a feature

    visualCaptcha icon
    • Discontinued As from Dec 26, 2016: Please note visualCaptcha is no longer actively developed. It still works and should continue to, but it won't be improved by the initial team anymore. ... Source: https://github.com/emotionLoop/visualCaptcha/blob/master/README.md

  • Securimage

    Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website...

    Free Open Source Web

    No features added Add a feature

  • Sblam!

    Open-source implementation of server-side spam filtering of blog comments and forum posts. It's available as a free web service. It's open source, so you can...

    Free Open Source Linux Web

    No features added Add a feature

    Sblam! icon

  • Negative Captcha

    A plugin to make the process of creating a negative captcha in Rails much less painful.

    Free Open Source Self-Hosted

    No features added Add a feature

    Negative Captcha icon

Platforms

Web / Online

Show 3 less popular platforms

License