
Description: GTmetrix is a free online tool that analyzes web pages for performance, providing a performance score and recommendations to improve speed.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: YSlow is a Firefox and Chrome browser extension that analyzes web pages and suggests ways to improve their performance based on Yahoo!'s performance best practices. It grades performance and provides tips to optimize page load speed.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API