Supported sensors

As Garmin extended the FIT file format, external sensors can now write their own data into any FIT file. This allows third party devices to write data that’s not part of the official FIT specification. In addition, sensors can write their own data for common fields (e.g. distance, heart rate, power, ...) without being connected as the respective sensor. Previously, Stryd was only able to record power data in cycling mode.

We are trying to add all supported sensors to this list. Tell us if you know that we support further external sensors. - And, of course, provide us with sample files if your sensor is not supported but will definetly enhance the analysis.


We will add further data fields to RUNALYZE in the future. Leave us a message if you are a sensor manufacturer, your sensor data is written to fit files and you are interested, that we add it to RUNALYZE.

SmO2 & THb

starting from version 3.1

SmO2 (muscle tissue oxygen saturation) and THb (Total Hemoglobin concentration)


The well known Stryd power meter