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NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS.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

To help with keep the bots at bay this gem helps you easily add honeypots to forms and/or obfuscate your form field names

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

Captcha-Plugin for Rails

0-9 arası sayıları kullanarak random olarak 2 sayı seçer ve yine random olarak toplama ya da çarpma yaparak sonucu verir.

A simple and custom captcha for Rails3.

Google reCaptcha helpers and verifier

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

Captcha based on encyrpting and decrypting user data by mathematical operation

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

Submit captcha images and retrieve the text as a string.

Merb plugin that provides resource access rate limits and captcha'ing

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

Rails mountable engine, that provides captcha support

Simple negative captcha for Rails

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.

Generates and verifies ascii art captcha.