There's an Android app called Gadgetbridge which is open source and keeps your data local. I use it with an Android watch (I forget which one exactly). I don't

There's an Android app called Gadgetbridge which is open source and keeps your data local. I use it with an Android watch (I forget which one exactly). I don't know how it compares in quality with the phone-home vendor app, since I replaced that immediately. https://gadgetbridge.org/ https://gadgetbridge.org/