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

Easy to use classical captcha for Rails apps

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.

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

A gem to generate captcha pictures.

Captcha Client for YunPian.com

Metabypass | Ruby-based easy implementation for solving any type of captcha by Metabypass

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

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

Ruby package for easy integration with the API of 2captcha captcha solving service to bypass recaptcha, hcaptcha, funcaptcha, geetest and solve any other captchas.

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

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

Captcha based on encyrpting and decrypting user data by mathematical operation

Submit captcha images and retrieve the text as a string.

Captchator as Rack middleware, and helpers for sinatra.

Death by Captcha Ruby implementation (HTTP API)

A captcha solver (only for easy ones) gem

Simple negative captcha for Rails

A library to make creating negative captchas less painful

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.