
Description: reCAPTCHA is a free service by Google that protects websites from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart. The service provides different versions of CAPTCHAs and captcha alternatives to fit site needs.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Negative Captcha is a CAPTCHA alternative that asks users to identify photos without specific objects instead of solving a visual puzzle. It aims to improve accessibility and user experience.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API