Speed Tools

Free Web Performance Tools

Test, audit and compare website performance with our free speed tools.

Run a Lighthouse performance audit from multiple global locations and device types, completely free.

Check whether your site passes Google’s Core Web Vitals assessment using real-world Chrome UX Report data.

See how the world's top websites perform, compared by industry. Updated monthly.

Compare up to 5 websites by Core Web Vitals performance, ranked and scored side by side.

Community & Open Source

We actively work on advancing web performance tools for the benefit of the community.

GitHub Image Actions

Automatically compress images in your Pull Requests.

Calibre CLI

Access and automate your Calibre speed monitoring data.

Google Lighthouse

We contribute to Lighthouse, the engine behind our monitoring.

Chrome HAR

We maintain and improve Chrome HAR for creating HAR files.

Core Web Vitals from every visit to your site. A small, privacy-first script, ready in minutes.

Google’s search data for any site, including competitors. Nothing to install.

Consistent lab tests give you a steady baseline and fast feedback on every change.

See it? Fix it. Start improving UX & performance today.