wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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.

The idi_captcha_generator gem provides a customizable CAPTCHA solution tailored for high-traffic applications, ensuring that only legitimate users can access features like sign-up and login forms. By leveraging image-based questions, it prevents automated systems from bypassing security measures....

Anti Captcha is an automated CAPTCHA solving service

anti-captcha is a Ruby library for recognize captcha on anti-captcha.com

A Ruby gem that uses Tesseract OCR to extract text from UDISE captcha images. This gem helps in automating UDISE-related tasks by providing captcha reading capabilities.

A Ruby gem for integrating Friendly Captcha v2 into your applications. Friendly Captcha provides privacy-first, GDPR-compliant bot protection without tracking users or requiring them to solve puzzles.

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

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.

A Google-style captcha for enterprise Rails apps

A captcha verification approach for Rails apps, directly integrated into ActiveRecord’s validation mechanism and providing helpers for ActionController and ActionView.

A Google-style captcha for enterprise Rails apps

A captcha solver (only for easy ones) gem

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

Rails mountable engine, that provides captcha support

generate captcha by dalli,use the memcache

MVC based Math, Logic Captcha

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

Simple, easy captcha for Sinatra

simple stupid captcha