Quick little arithmetic plain-text captcha

Ruby wrapper for Yandex.Cleanweb

create captcha for api based project

This is mt first gem

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

This version include two important page 'Contact' and 'Register' with the 'Math-Captcha' method submit for prevent hacker attack.

Russian Post tracking toolset, consisting tracking form bot (since Russian Post is too retarded for normal API) and captcha solver/recognizer.

This is a gem wrapper for tiny captcha in C with no dependencies.

IQ, Math Captcha

Generates and verifies ascii art captcha.

A smart captcha library

Simple negative captcha for Rails

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

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

TrustCaptcha – Privacy-first CAPTCHA solution for Ruby. GDPR-compliant, bot protection made in Europe.

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

A gem to generate captcha pictures.

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

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

AntiCaptcha api ruby wrapper