adds audio support to 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.

Rails extension for Cloudflare's Turnstile CAPTCHA alternative. This gem should work with Rails 6.x and 7.x, and with Faraday 1.x and 2.x.

Helps humankind with simpler captchas

Form protection with simple captcha calculations.

ZeroCaptcha allows companies to solve captchas with artificial intelligence software, which is faster than humans and very accurate

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

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

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

It's a Rails Captcha Engine for Rails 3 applications.

Gem that uses RuCaptcha API to solver any type of captcha

Captcha library which uses imagemagick to create captchas

Repackaged visualCaptcha's backend service, including translation and minor modification. Mainly for private use. Everything still belongs to original author: emotionLoop. ...

Ruby wrapper for Yandex.Cleanweb

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.

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

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

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

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