Small tools for runners.

Enter a finish you have run and see the equivalent time on other courses — UTMB, Western States and 3,000 ultras, or Berlin, London and the marathon majors — using course-difficulty models built on millions of results.

Free. Built on the hardest-ultras and fastest-marathons lab models — runs entirely in your browser.

Drop your Garmin or Strava export and watch a decade of your runs draw itself as a living point cloud — parsed and rendered entirely in your browser, nothing uploaded.

Best on desktop. Free for ontrack runners — your code is in the app under Settings → Your footprints.

Connect a Bluetooth heart rate monitor — a Garmin strap or a watch in broadcast mode — and watch your heart beat live, departure-board style. Nothing is recorded.

Works in Chrome and Edge on desktop and Android.