Due to many unrequited complaints to the recaptcha team with regard to its unreadability for real human users, this gem offers a more readable selection of captcha images.

Simple captcha based on plain text questions.

Simple captcha image generator gem

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

Block repetetive requests from logged_in users and shows captcha.

Simple captcha

This version include two important page 'Contact' and 'Register' with the 'Math-Captcha' method submit for prevent hacker attack.

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

Generates and verifies ascii art captcha.

Rails mountable engine, that provides captcha support

Solve Media CAPTCHA Replacement

Submit captcha images and retrieve the text as a string.

Ruby port of VIT AutoCaptcha

This is mt first gem

A gem to generate captcha pictures.

RedisCaptcha provides simple captcha that can be read by human.

Metabypass | Ruby-based easy implementation for solving any type of captcha by Metabypass

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

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

adds audio support to simple captcha