Unobtrusive, flexible and complete spam protection for Rails applications using honeypot strategy for better user experience.

A library to make creating negative captchas less painful

A very simple rack captcha middleware via captchator.com API

Captcha-Plugin for Rails

A simple way to add honeypot captchas to Rails forms

Captcha library which uses imagemagick to create captchas

A plugin to make the process of creating a negative captcha in Rails much less painful

TwoCaptcha allows you to solve captchas with manual labor

Captcha Gem for Rails, which generates captcha image by Rust.

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

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

Due to many unrequited complaints to the recaptcha team with regard to its unreadability for real human users, this gem offers a more readable selection of captcha images.

NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS.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.

Wrapper for Captchabot.com

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

Captcha based on encyrpting and decrypting user data by mathematical operation

Submit captcha images and retrieve the text as a string.

A simple way to add zero friction captchas to Rails forms

ZeroCaptcha allows companies to solve captchas with artificial intelligence software, which is faster than humans and very accurate

Captchator as Rack middleware, and helpers for sinatra.