Free tools for runners
Analyze your runs. Clearly.
Drop a GPX to see your route on a real map with distance, elevation and splits — plus a heart-rate zone calculator and a pace converter. Everything runs in your browser. No login, nothing uploaded.
GPX viewer
Map, distance, elevation, pace and splits from any .gpx file.
Open tool →Race planner
Goal pace and km-by-km splits for 10K, half, marathon or any distance.
Open tool →Heart-rate zones
Your 5 training zones from age or max HR — %HRmax or Karvonen.
Open tool →Pace converter
Convert pace ⇄ speed: min/km, min/mile, km/h, mph, both ways.
Open tool →Why Guaruna
Run by the numbers — free and private.
Turn your GPS data into clear, actionable insight. No account, nothing uploaded, no ads in the way.
See every run on a real map
Drop a GPX file from your watch, Strava or Komoot and the GPX viewer maps your exact route over OpenStreetMap, then breaks it down: total distance, elevation gain and loss, moving pace, and a kilometre-by-kilometre split table. Hover the elevation profile to read the altitude at any point on the course. Everything is computed in your browser — your track never leaves your device.
Train at the right intensity
Easy days easy, hard days hard. The heart-rate zone calculator turns your age or max heart rate into five clear training zones using the %HRmax or Karvonen method, while the pace converter switches instantly between min/km, min/mile, km/h and mph. Know exactly how fast — and how hard — each session should be.
Plan your next race
Chasing a sub-2-hour half or a marathon personal best? Pick your distance — 10K, half, marathon or any custom length — set a goal time, and the race planner gives you the average pace to hold plus a full pacing table to race by. Even splits, no surprises at the finish line.
GPX route database
A separate, community-shared library of running routes — browse them, download them, open them in the viewer, or add your own. Not a tool, just GPX.