How many files can I add?

There is no hard limit — add a whole season of activities. Very large numbers of files will use more memory since everything is processed locally.

Why do some areas look brighter?

Each route is drawn semi-transparent, so wherever routes overlap the colour builds up. The more often you pass through a place, the brighter it gets.

Yes. GPX, FIT and TCX files can all be added together — they are read into the same model before being drawn.

Are my files uploaded to a server?

No. Everything runs in your browser. Your files never leave your device.

Build a route heatmap

Drop as many activities as you like to overlay every route on a single map. The roads and trails you ride or run most often build up and glow brighter. Nothing is uploaded — everything runs in your browser.

Drop files or click to browseGPX, FIT or TCX — add as many as you want

How to build a heatmap

1
Drop your activities
Select or drag in all the .gpx, .fit or .tcx files you want to include. You can add more at any time.
2
Watch the map build up
Every route is drawn on one map. Overlapping segments stack up and stand out where you go most often.
3
Refine your selection
Remove any file you don't want, or clear everything and start again. The map updates instantly.

Frequently asked questions

How many files can I add?: There is no hard limit — add a whole season of activities. Very large numbers of files will use more memory since everything is processed locally.
Why do some areas look brighter?: Each route is drawn semi-transparent, so wherever routes overlap the colour builds up. The more often you pass through a place, the brighter it gets.
Can I mix formats?: Yes. GPX, FIT and TCX files can all be added together — they are read into the same model before being drawn.
Are my files uploaded to a server?: No. Everything runs in your browser. Your files never leave your device.