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

A gem to generate captcha pictures.

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NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS.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

Captcha Client for YunPian.com

Display and verify arcaptcha service captcha

A simple and custom captcha for Rails3.

Google reCaptcha helpers and verifier

Rack middleware Captcha verification using Recaptcha API.

AntiCaptcha api ruby wrapper

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

Arithmetic Captcha

Implements view helpers for the ASIRRA CAPTCHA system for Rails-based websites

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

Captcha-Plugin for Rails

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

BrainBuster - a logic captcha for Rails