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.

Anti Captcha is an automated CAPTCHA solving service

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

Gem that uses RuCaptcha API to solver any type of captcha

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

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id

Easy to use classical captcha for Rails apps

A gem to generate captcha pictures.

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

Captcha Client for YunPian.com

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

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

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

Tencent Cloud Ruby SDK is the official software development kit, which allows Ruby developers to write software that makes use of Tencent Cloud service CAPTCHA.

Display and verify arcaptcha service captcha

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

To help with keep the bots at bay this gem helps you easily add honeypots to forms and/or obfuscate your form field names

NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS. Based on Login Attempts check if captcha is necessary. It stores a permanent cookie and uses a table for tracking login requests.

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.

This library can help you create a captcha in your terminal application, which may be damaged by a large influx of requests.