Calibre Documentation

Calibre is a website performance and user experience monitoring tool. Teams use Calibre to monitor Core Web Vitals and other important speed metrics across all their sites.

Use it to regularly audit performance, test your site under different user conditions, and track changes as you build and deploy. Start your free 15-day trial today.

Get started

Websites in Calibre are grouped into Teams, which you can use to organise by project, client, or even competitors.

Quick start

Monitor your first site with this walk-through.

Metrics

Learn about performance metrics collected by Calibre.

Command line interface

Manage your workspace and performance data in terminal.

Node.js API

Integrate with Calibre’s API and data pipeline.

Need Help?

Contact support.
Check out our changelog.
Questions? Contact sales.