The sleep tracker seems to be quite poor - e.g. misrecognizing time spent in bed as time asleep. This was the same problem I had before with a xiaomi. It was so inaccurate on all fronts I just ditched the thing.
I wasnt expecting the colmi to be accurate for this low price, but still.
For gadgetbridge I dont think there are any good sleep trackers and the only two I know of that are genuinely accurate are the apple watch and oura (theres a guy who tests them all on youtube - this is what he found).
Id happily pay extra for a decent non-apple local storage only fitness tracker which integrates with OSS and doesnt upload every heartbeat to the cloud but it does not seem to exist.
