Speed differences Polar Flow vs Strava
I record my bike rides using Polar Flow (latest version) on my iPhone and auto-export them to Strava. I've realised that Polar Flow and Strava report different average and top speeds. For example:
Polar Flow: Avg 25.7 km/h, Max: 40.1 km/h
Strava: Avg 26.1 km/h, Max: 56.5 km/h
The duration and length of my ride are (almost) the same in both apps. I didn't make a pause or lap, it was just starting and stopping.