Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

jQuery slide captcha system with jQuery & jQuery UI for Rails 3

Quick little arithmetic plain-text captcha

create captcha for api based project

MVC based Math, Logic Captcha

dongsx

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

A smart captcha library

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

RedisCaptcha provides simple captcha that can be read by human.

Captcha based on encyrpting and decrypting user data by mathematical operation

A very simple rack captcha middleware via captchator.com API

Captcha based on encyrpting and decrypting user data by mathematical operation

Simple, easy captcha for Sinatra

My version of SimpleCaptcha

RMagickCaptcha is a gem that implements captcha for using in Rails application.

Simple captcha image generator gem

HumanDetector is a friendly logic captcha for Rails the doesn't require any external system dependency (e.g. external captcha API connections). It uses a simple question that any 7 or more years old human can understand, but that a spambot will not be able to answer. This Gem supports Ruby v1.9.2 and Rails 3.0.x.