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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.

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.

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

DeathByCaptcha allows you to solve captchas with manual labor

Description of TinyCaptcha.

Rack middleware Captcha verification using Recaptcha API.

RubyGem package for visualCaptcha's backend service

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

Death by Captcha Ruby implementation (HTTP API)

Captcha based on encyrpting and decrypting user data by mathematical operation

A captcha solver (only for easy ones) gem

RedisCaptcha provides simple captcha that can be read by human.

A library to make creating negative captchas less painful

Google reCaptcha helpers and verifier

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

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