Free Tools

Website speed check based on the Chrome UX Report.

Discover how fast your site is for real users with real data from the Chrome UX Report. Read more »

Online 'Timing-Allow-Origin' Checker

This tool tests whether a page can use the Resource Timing API to gather performance information from third party domains and CDNs. The Resource Timing API g... Read more »

Online HTTP Cache Checker

This tool shows how web browsers will cache a URL. HTTP caching reuses previously loaded resources and can greatly impact performance. Learn more about [HTTP... Read more »