Helps humankind with simpler captchas

This plugin adds helpers for the YinXiangMa CAPTCHA API

Quick little arithmetic plain-text captcha

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

create captcha for api based project

This is mt first gem

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

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

API to interact with BrandCAPTCHA http://www.pontamedia.com/en/brandcaptcha/

Simple negative captcha for Rails

Metabypass | Ruby-based easy implementation for solving any type of captcha by Metabypass

Generates and verifies ascii art captcha.

Antigate (Decode captcha service) wrapper for Ruby

Description of TinyCaptcha.

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

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

Display and verify arcaptcha service captcha

Antispam helps prevent spam in your Rails applications by checking against DNS blacklists and spam-prevention databases. It has two core features: (1) IP-based spam detection using Project Honey Pot to block known spammers automatically, and (2) content-based spam detection using Defendium’s mach...

This gem provides integration with TrustCaptcha for Ruby applications, offering CAPTCHA verification with a focus on security and privacy.