Free Tools

Online HTTP Cache Checker

Check how web browsers will cache your website or asset URL. HTTP caching reuses previously loaded resources and can greatly impact performance. Read more »

Keyword Vitals Extension

Discover the performance metrics that matter to your SEO keywords with live data injected into your Google Search Pages. Read more »

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 »