Gem that uses RuCaptcha API to solver any type of captcha

A simple image-based CAPTCHA engine for Rails 6+, works offline and supports Devise integration

EU captcha protects your website/API against abuse like form spam and credential stuffing

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...

RubyGem package for visualCaptcha's backend service

Arithmetic Captcha

Drop in feedback engine with customizable fields, and captcha available

FerrumMCP is a browser automation server that implements the Model Context Protocol (MCP), enabling AI assistants to interact with web pages through a standardized interface. Features include navigation, form interaction, content extraction, screenshot capture, JavaScript execution, cookie manage...

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

This gem provides integration with TrustCaptcha for Ruby applications, offering CAPTCHA verification with a focus on security and privacy.

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

Description of TinyCaptcha.