Deliver stellar experiences to everyone

Monitor and audit web performance.
Make meaningful improvements where it matters.

Start my free trialor Book a demo

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


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

Stay on track with budgets

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

Get started with Budgets

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

Calibre delivers the substance behind the statistics. They know the actionability of performance measurement is paramount.

Paul Irish, Staff Software Engineer


Review changes in Pull Requests

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

Review performance before releases

Automate your performance system

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

Start scripting with Node.js API

Receive regular performance reports

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

Get Insights Report in your email

Be confident of results

Never question your performance 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.