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Look at the supported wearables for GadgetBridge

FOSS, doesn't have network permissions, can export data or interface with other apps

+1 for this. It makes my Amazfit watch from a privacy nightmare into a great cheap privacy conscious watch.

I just wish it could export SpO2 values and update the AGPS almanac. Because of this a GPS lock takes very long.

Late Amazfit watches require online signup in a quite cumbersome way in order to pair.

I can also vouch for Gadgetbridge being a great option.

I use it with a MiBand 6.