Athletes often train with more than one power source – smart trainer, crank or pedal power meter, sometimes a separate head unit – and it’s not always clear which one to trust. This FIT File Comparison tool lets you load up to three devices from the same ride, align them second-by-second, and visualise differences in power, heart rate, cadence and speed. You can quickly see dropouts, offsets and noise, and get summary stats that show how far each device sits from your chosen reference. Whether you’re checking an indoor trainer against on-bike power, validating a new sensor, or just troubleshooting odd files, this tool helps you make data-driven decisions instead of guessing.

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Note on speed parsing, I will need to work on it a bit more to extrapolate speed from GPS, so for now speed would work with a direct data stream called speed -  thank you for your patience