Use Turnstile by Cloudflare to perform captcha validation in your Rails app

A captcha that uses images instead of garbled text

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

MVC based Math, Logic Captcha

Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.

Simple gem to add captcha or negative captcha to your Rails 3 application

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.

Captchator as Rack middleware, and helpers for sinatra.

Block repetetive requests from logged_in users and shows captcha.

Captcha based on encyrpting and decrypting user data by mathematical operation

Simple captcha image generator gem

Description of TinyCaptcha.

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

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.

RubyGem package for visualCaptcha's backend service

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

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

Simple captcha

IQ, Math Captcha

Solve Media CAPTCHA Replacement