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

.

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...

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

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.

Description of TinyCaptcha.

RubyGem package for visualCaptcha's backend service

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

Rack middleware Captcha verification using Recaptcha API.

Captcha Gem for Rails, which generates captcha image by Rust.

A smart captcha library

Wrapper for Captchabot.com

RedisCaptcha provides simple captcha that can be read by human.

generate captcha by dalli,use the memcache

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

IQ, Math Captcha

Simple negative captcha for Rails

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.