Captcha-Plugin for Rails

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

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

ReCaptcha implements view helpers to generate ReCaptcha code, with the noscript counterpart, required methods that interface with the HTTP API for captcha verification, a DSL to generate a before_filter and the code to implement AJAX captcha validation.

HumanDetector is a friendly logic captcha for Rails the doesn't require any external system dependency (e.g. external captcha API connections). It uses a simple question that any 7 or more years old human can understand, but that a spambot will not be able to answer. This Gem supports Ruby v1.9.2...

A smart captcha library

Captcha generator for rails

DeathByCaptcha allows you to solve captchas with manual labor

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

simple stupid captcha

Captchator as Rack middleware, and helpers for sinatra.

jQuery slide captcha system with jQuery & jQuery UI for Rails 3

Submit captcha images and retrieve the text as a string.

A very simple rack captcha middleware via captchator.com API

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

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

RMagickCaptcha is a gem that implements captcha for using in Rails application.

A simple and custom captcha for Rails3.

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