Fitness/Sleep tracking with privacy

I want to buy fitnesstracker or a smart watch that is capable of fitness tracking.
But I don’t want it so send any data out so I need the companion app to work without network permission.
Can someone recommend me options that aren’t that expensive but have sleep tracking?

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You may want to look into Gadgetbridge supported devices. Gadgetbridge is an open source app that replaces the companion app of these watch brands.

It also reimplements fitness tracking features, but these features often depend on the model itself on a case by case basis.

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Thank you for linking this

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I can vouch for the Amazfit Active 2 w/ GadgetBridge. Costs $100 IIRC. Sleep tracking is acceptable but not best in class if that is a dealbreaker as per The Quantified Scientist’s YT review.

Speaking of which, my suggestion is to cross-reference GadgetBridge’s highly compatible devices w/ YT reviews.

The thing is that sleep tracking is the main reason I want a smart watch / fitnesstracker

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Do you mean What is the best device? - Gadgetbridge ?
I checked some devicesbut most don#t have or only have basic sleep tracking:
The only watch brand there with good sleep tracking is Huawei, but I am not sure if Huawei is a good idea regarding privac in the case that I need the native app.