Front-End performance monitoring tool

We help to analyze how fast (or slow) visitors load your site.


This project was born as internal analytic tool and made public
to help developers to analyze their sites performance without reinventing the wheel.

Fast kickstart

Start analyzing site performance by adding a few lines of JS code

Page load speed

See the full picture of how users from around the world load your site

How good your CDN works?

Analyze which edge servers of your CDN provider users go to


Create line charts to track page load speed for any period of time

NavigationTiming API

Track page load speed since any of NavigationTiming marks

Custom metrics on charts

Use Performance API to log and display your own performance metrics

Proudly Open Source

Our client library is open source and powered by open source software.
The code is available on GitHub.