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

DeathByCaptcha allows you to solve captchas with manual labor

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

A simple way to add honeypot captchas to Rails forms

A library to make creating negative captchas less painful

ActsAsTextcaptcha provides spam protection for Rails models with text-based logic question captchas. Questions are fetched from Rob Tuley's textcaptcha.com They can be solved easily by humans but are tough for robots to crack.

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

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

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

Captcha-Plugin for Rails

TwoCaptcha allows you to solve captchas with manual labor

Arithmetic Captcha

Rack middleware Captcha verification using Recaptcha API.

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...

Simple reverse captcha solution that consist in create a hidden field that should be always empty.

Quick little arithmetic plain-text captcha

A smart captcha library

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

dongsx

Anti Captcha is an automated CAPTCHA solving service