Simple negative captcha for Rails

A Google-style captcha for enterprise Rails apps

A simple CAPTCHA implementation for Rails 5+ based on RMagick.

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

Submit captcha images and retrieve the text as a string.

Wrapper for Captchabot.com

Simple captcha

Anti-spam protection for your website

A simple way to add zero friction captchas to Rails forms

This is a Captcha gem for ruby. It drawing captcha image with C code so it no dependencies.

Simple reverse captcha solution that consist in create a hidden field that should be always empty.

Simple Audio Extension to Simple Captcha

Block repetetive requests from logged_in users and shows captcha.

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

Easy to use classical captcha for Rails apps

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

Captcha form Jike API

Arithmetic Captcha

Arithmetic Captcha

SoaringSimpleCaptcha is available to be used with Rails 3 or above and also it provides the backward compatibility with previous versions of Rails.