GTmetrix

Web performance testing with Core Web Vitals metrics.

Use it when

Analyzing slow websites and finding exact bottlenecks.

Performance Testing

Verified

Google performance analyzer for Core Web Vitals, Lighthouse diagnostics, and speed opportunities.

freeEasy

Verified 1 day ago

Analytics

Verified

Inspects any website to reveal its tech stack.

freemiumMedium

Verified Mar 23

Developer Workflow

Verified

Find the performance cost and size of adding an npm package.

freeMedium

Verified Mar 23