You need a smartphone with Android version 5.1 or higher or an iOS phone.
Then, you can download the BikeCompanion application for Android here:
https: //play.google.com/store/apps/details?id=fr.creativeo.bike.companion&hl=fr&gl=fr
for iOS here :
https://apps.apple.com/app/gps-v%C3%A9lo-route-bikecompanion/id1661805112