What happens to your data within Jepster
DataJepster does collect your ride data when you are recording your ride.
This data containts a.o. your GPS coordinates and heart rate data (if a heart rate sensor is connected).
The data is stored in a local database and a file (.fit extension)_on your device.
Your data is only send to Strava on your own request. The .fit file is send to Strava when you are uploading your activity to Strava.
Besides uploading on your own request your ride data is never send to a website or webservice.