Captchator as Rack middleware, and helpers for sinatra.

Generates and verifies ascii art captcha.

Wrapper for Captchabot.com

Anti-spam protection for your website

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.

Simple reverse captcha solution that consist in create a hidden field that should be always empty.

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

Simple Audio Extension to Simple Captcha

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

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.

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

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

Easy to use classical captcha for Rails apps

SimpleCaptcha is the simplest and a robust captcha. Its implementation requires adding up a single line in views and in controllers/models. SimpleCaptcha is available to be used with Rails2.0 or above and also it provides the backward compatibility with previous versions of Rails.

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Arithmetic Captcha

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

A Rails captcha gem that attempts to determine whether or not a user is human.

Captcha form Jike API

Simple captcha