SoaringSimpleCaptcha is available to be used with Rails 3 or above and also it provides the backward compatibility with previous versions of Rails.

Easy to use classical captcha for Rails apps

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

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

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