Gem that uses RuCaptcha API to solver any type of captcha

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

SimpleCaptcha is available to be used with Rails 3 + 4 or above and also it provides the backward compatibility with previous versions of Rails.

reCAPTCHA was too much for us, so we created this. Simplest captcha ever.

DeathByCaptcha allows you to solve captchas with manual labor

Rack middleware Captcha verification using Recaptcha API.

BrainBuster - a logic captcha for Rails

Rails extension for Cloudflare's Turnstile CAPTCHA alternative. This gem should work with Rails 6.x, 7.x, 8.x and with Faraday 1.x and 2.x.

ActsAsTextcaptcha provides spam protection for Rails models with text-based logic question captchas. Questions are fetched from Rob Tuley's textcaptcha.com They can be solved easily by humans but are tough for robots to crack.

Despamilator is a plugin based spam detector designed for use on your web forms borne out of two annoyances: Spam being submitted in my web forms and CAPTCHAS being intrusive. Despamilator will apply some commonly used heuristics from the world of anti-spam to help you decide whether your users a...

ALTCHA is a free, open-source CAPTCHA alternative that protects your website from spam and abuse

Drop in feedback engine with customizable fields, and captcha available

RubyGem package for visualCaptcha's backend service

Arithmetic Captcha

.

Simple negative captcha for Rails

Forked from https://github.com/kares/simple_captcha

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

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

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