Captcha form Jike API

Generates and verifies ascii art captcha.

generate captcha by dalli,use the memcache

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

A simple and fast image captcha generator that uses opencv and memcached.

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

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

Anti-spam protection for your website

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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Block repetetive requests from logged_in users and shows captcha.

Simple Audio Extension to Simple Captcha

Captcha-Plugin for Rails

Antigate (Decode captcha service) wrapper for Ruby

simple stupid captcha

Generates Text Catpchas, that are 'nice' by my own personal definition!

It's a Rails Captcha Engine for Rails 3 applications.

Ruby wrapper for Yandex.Cleanweb

SimpleCaptcha is available to be used with Rails 3 + 4 or above and also it provides the backward compatibility with previous versions of Rails.

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