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Calibre Documentation

Calibre is a web performance monitoring platform. Track Core Web Vitals, run Lighthouse audits, set performance budgets, and monitor real user performance with synthetic and real user monitoring.

For agents: Calibre docs: web performance monitoring platform for Core Web Vitals, Lighthouse audits, performance budgets, and real user and synthetic monitoring.

web performance monitoringcore web vitalslighthousereal user monitoringperformance budgets

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# Calibre Documentation

> Calibre is a web performance monitoring platform. Track Core Web Vitals, run Lighthouse audits, set performance budgets, and monitor real user performance with synthetic and real user monitoring.

## Overview

- [What is Calibre](https://calibreapp.com/docs/what-is-calibre): Calibre (calibreapp.com) is a web performance monitoring platform that combines Real User Monitoring, Chrome User Experience Report data, and Synthetic Testing into a single platform.
- [How Calibre is Different](https://calibreapp.com/docs/how-calibre-is-different): An honest comparison of Calibre with other web performance monitoring approaches, including Lighthouse, APM tools, and dedicated performance platforms.

## Get Started

- [Getting Started with Calibre](https://calibreapp.com/docs/get-started): Set up Calibre to monitor your website's performance with CrUX, Real User Monitoring, and Synthetic testing.
- [View Core Web Vitals for All Sites](https://calibreapp.com/docs/get-started/your-sites): Get a bird's-eye view of performance across all your Sites with Synthetic, CrUX and Real User Monitoring data.
- [Creating a Team](https://calibreapp.com/docs/get-started/teams): Learn how to create and manage Teams to divide work in Calibre.

## Understand Your Data

- [Why your Synthetic, CrUX and RUM numbers differ](https://calibreapp.com/docs/concepts/understanding-your-data): Synthetic, CrUX and Real User Monitoring each measure performance differently. Here is why their numbers rarely match, and why that is expected.
- [Which data source to use when](https://calibreapp.com/docs/concepts/choosing-a-data-source): A decision guide for choosing between Synthetic testing, CrUX and Real User Monitoring for a given performance question.

## Metrics

- [Metrics Guide](https://calibreapp.com/docs/metrics): Learn what crucial site speed metrics represent.
- [Largest Contentful Paint](https://calibreapp.com/docs/metrics/largest-contentful-paint): Largest Contentful Paint is a metric that reports the time at which the largest above-the-fold element was rendered.
- [Interaction to Next Paint](https://calibreapp.com/docs/metrics/interaction-to-next-paint): Interaction to Next Paint is an experimental metric that reports the longest delay between user interaction and the browser response on the page.
- [Cumulative Layout Shift](https://calibreapp.com/docs/metrics/cumulative-layout-shift): Cumulative Layout Shift measures how much elements move unexpectedly during a page view session.
- [First Contentful Paint](https://calibreapp.com/docs/metrics/first-contentful-paint): First Contentful Paint is a metric that reports the time when first content becomes visible.
- [Total Blocking Time](https://calibreapp.com/docs/metrics/total-blocking-time): Total Blocking Time is a metric that describes JavaScript main thread activity.
- [Time to First Byte](https://calibreapp.com/docs/metrics/time-to-first-byte): Time to First Byte reports the time between a request for a r
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