Time to Interactive history for mobile and desktop

Understand and improve your site speed

An all-in-one speed monitoring platform with transparent reports and actionable advice to make your sites fast.

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The world’s best brands chose Calibre to be their speed companion

buzzfeed
ableton
mapbox
codepen
propublica
Create test profiles

Simulate real-world conditions

Understand what your audience is experiencing. Choose from global test locations, turn off ads or mimic mobile devices effortlessly.

Learn about your users

Metric budget alert for a metric that exceeded a set budget

Stay on track with budgets

Know about speed regressions before they affect your sales. Always meet your goals.

Get started with Budgets

Third party transfer size by category

Understand the impact of third party code

See the impact of external scripts quickly. Make informed decisions on which tools to use without losing speed.

Analyse the cost of Third Parties

Profile photo of Carolina J Pernaut

Guaranteeing our clients good performance and best practices has never been easier for us.

Carolina J Pernaut, QA Practice Manager

itx
GitHub comment comparing pull request metrics to site metrics

Review changes in Pull Requests

Spot speed changes before releasing to production. Bring accountability to the entire development team.

Review site speed before releases

Example Node.JS script export Time Series data from Calibre

Automate your speed monitoring system

Create tests and access metrics in a breeze. Export data and integrate with your favourite tools.

Start scripting with Node.js API

Calibre insights email preview containing weekly statistics

Receive regular speed reports

Save hours on distilling speed data. Receive beautiful reports on crucial metrics, weekly or monthly.

Get Insights Report in your email

Product log showing test quarantined, re-tested and verified

Be confident of results

Never question your speed data. Calibre runs an AI-powered validation engine to ensure the most reliable performance results on the market.

Start your free 15-day trial

Set up in minutes. Nothing to install.