FitFileLab
Analysis5 min read

How to compare two GPS activities side by side

Ran or rode the same route twice and want to know where you gained time? Comparing two activities overlays the tracks and puts the stats face to face — far clearer than flipping between two screens. Here's how, whatever format your files are in.

Why compare two activities?

Overlaying two outings shows the differences concretely: a track that cuts the corner in the right spot, a section where pace dropped, a climb tackled differently. It's the ideal tool to analyse progress on a familiar route or compare two race strategies.

How to compare your files

  1. 1

    Open the compare tool

    It accepts GPX, FIT and TCX, in any combination.

  2. 2

    Drop in your two files

    Drag the first then the second activity. They appear overlaid right away.

  3. 3

    Read the gaps

    Tracks on the same map, aligned elevation profiles and stats side by side: distance, duration, elevation, pace.

Compare two activities

Your files are parsed in the browser, never sent to a server. No sign-up.

Visualize a single activity

Just want to examine one outing in detail rather than compare two? The viewer opens any file with map, elevation and stats.

Visualize an activity

FAQ

Can I compare a GPX with a FIT?
Yes. The tool reads GPX, FIT and TCX interchangeably: you can compare two different formats without converting them first.
Do both activities need to be on the same route?
No, but the comparison is most telling on a shared or similar route. On different routes, you're mainly comparing overall statistics.
Are my files sent online?
No. All analysis happens in your browser, with no upload, which keeps your data private.
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