[kevingrahl]

Personally I’m using a Xiaomi Mi Smart Band 4 on iOS 13 with an open source on device firewall. That way I can still use the official Apps like MiFit or AmazFit to sync all data to Apple Health without it being uploaded from their App to elsewhere. Make sure to use iOS12 or upwards and you’ll have to enable 2 Factor Authentication in order for your Apple Health data to be end to end encrypted.

I’m not sure how Android holds up but it should be possible to achieve something similar there, I’d guess. On Android there are third party Apps for syncing which should make things easier.

Pros: * Mi Band 4 is very cheap * Reliable HR, steps, activity & sleep tracking * Easy and quick setup * > 20 days battery life * Custumizable watch faces * 5ATM water resistant

Cons: * Xiaomi and Huami are Chinese companies * No always on display (but raising watch turns on display) * Some data could leak should the firewall fail * Currently no third party Apps for syncing to iOS

I wrote a short article about using the Mi Band 4 on iOS with a focus on privacy on my website if you’d like to know a bit more.