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Despamilator is a plugin based spam detector designed for use on your web forms borne out of two annoyances: Spam being submitted in my web forms and CAPTCHAS being intrusive. Despamilator will apply some commonly used heuristics from the world of anti-spam to help you decide whether your users a...

Captcha-Plugin for Rails

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

Unobtrusive, flexible and simple spam protection for Rails applications using honeypot strategy for better user experience.

reCAPTCHA was too much for us, so we created this. Simplest captcha ever.

Description of TinyCaptcha.

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

Rack middleware Captcha verification using Recaptcha API.

DeathByCaptcha allows you to solve captchas with manual labor

RubyGem package for visualCaptcha's backend service

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

you will get arithmatic sum with answer you just have to compare with ur user in controller

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.

Captcha based on encyrpting and decrypting user data by mathematical operation

Merb plugin that provides resource access rate limits and captcha'ing

Death by Captcha Ruby implementation (HTTP API)

Rails mountable engine, that provides captcha support

A library to make creating negative captchas less painful

Generates and verifies ascii art captcha.