Submit captcha images and retrieve the text as a string.

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

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

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

BrainBuster - a logic captcha for Rails