Hi, I currently have a Samsung smartwatch, which I have linked, but I miss the electrocardiogram function. I'm thinking of buying one, can anyone recommend one that allows an electrocardiogram, and the latest advanced functions, such as body composition, and that everything works 100% with Graphene OS? I have Google services activated, and Google Play, it's not a problem for me to activate what I need in my main profile. Thanks in advance
Smartwatch for Graphene os
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You might like www.gadgetbridge.org.
They support over 300 devices, Pixel Watches not included though. It works great with GOS, I've been using it for nearly two years.
You forgot to mention Fitbits are not supported
Emerald and with that link it supports sleep tracking, electrocardiogram, physical activity tracking etc.? I'm looking for a high-end watch
Been using some Garmins. Everything seems to work, although capabilities will depend on the functions of your watch. ECG only has regulatory approval in a few countries and mine isn't included, so I didn't bother getting a watch that supported it.
The nice thing about Garmin is they take a different approach from Apple and Google/Samsung - those put iOS and Android on their watches, which is why you only get 1-2 days of battery life. Garmins run a tiny microcontroller and low power displays so you get weeks of battery life, at the cost of a more limited range of apps (they have to fit in a few hundred KB).
Garmins are also supported to some degree in Gadgetbridge, although I couldn't say which metrics are computed on watch and which need a cloud connection - GB can't do those.
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And for everyone who does not need every function that the apple watch has, there is good news about Pebble (if some people remember 10 years later) :D
Unfortunately, we have to be a little patient:
https://repebble.com/
I haven't tried to use Polar with GrapheneOS, but they have an open source SDK for their watches and promise that users maintain ownership of their own data.
https://www.polar.com/
https://github.com/polarofficial/polar-ble-sdk
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This is a good FOSS smartwatch for anyone looking, but I'm not sure if it supports the features you want.