Real User Monitoring
Track real visitor experience on your websites
Chrome User Experience Report
See website performance, just like Google
Synthetic Page Speed testing
On-demand & scheduled performance checks
Blog
Insights, guides and updates from Calibre
Help Docs
How to make the most out of Calibre
Changelog
Summary of new features & improvements
Website Speed Leaderboards
Benchmark the world’s top websites by industry
Core Web Vitals Test
See if sites pass Google’s assessment
Website Speed Test
Measure and audit pages for free
Speed Comparison
Compare up to 5 websites side by side
Our Test Agents are now using Lighthouse 9.5 and Chrome 99 to test your Sites.