Another vote here for Garmin. A few years ago, I sat down and read the major brands' privacy policies cover to cover, and Garmin's was the most reasonable. It was the right compromise for me between privacy and utility...but I do feel like I should have another privacy policy reading party sometime soon and make sure the equation hasn't changed.
Mozilla's Privacy Not Included Project also says that Garmin has a solid privacy policy.
For some types of tracker, you can use a free and open source application called gadgetbridge.
I use it with my Amazfit Bip, and it works just fine. Since it's FOSS, it's something that can be audited for backdoors
It's a great app, and the amazfit watches have really good battery life. Some will even let you answer your calls, which I find makes me stress about my phone a lot less.
The spreadsheet.
Always start with the spreadsheet, and go uo from there!
Fitotrack for running, available on F-droid.
I did this dance a while back and they all will use your data to some degree, so I opted to change the other side of the equation and maximized the utility as best I could and to do that I looked for a tracker that didn't require a subscription for features that are already in the watch.
I opted for a Garmin watch, (a refurbished Vivoactive4S, specifically), specifically for that reason and also for long battery life (My wife recharges her Apple watch daily but my watch lasts all week and newer models last even longer).
If you are privacy-minded, you can obviously set up your Google connect account with a burner email, but much of the workout tracking does utilize GPS. You may be able to turn that off but I haven't experimented there.
I’m personally of mixed opinions about Garmin.
On the one hand, I think they make the best products. Both their hardware and software as far as fitness tracking features is just brilliant. Not having any subscription is also an absolute must-have for me.
On the other hand, they operate their no-subscription business model by being extremely stingy with software updates. You might get one year of feature updates to your watch or bike computer, and maybe some critical security updates after that. But that’s about it. Apple has a mostly-undeserved reputation for planned obsolescence, but Garmin absolutely lives by that model. Sure, my Forerunner 935 isn’t going to suddenly be able to do digital payments without an NFC chip in there, but there’s no reason it shouldn’t be able to guesstimate my heat adaptation or do the same Body Battery calculations that the device from one year later is capable of using the same wrist heart rate monitor.
I’m also not sure I’d trust them on privacy too much. I trust them not to deliberately send your data to anyone malicious, or even use the data indirectly for non-customer-centric reasons. Their business model is much more like Apple than Google or Facebook in that respect. And that’s certainly a very good thing from a privacy standpoint. But I don’t think they’re a company that takes security very seriously. The rumour is that they probably had to pay the ransom when they were hit by ransomware a year or two ago, because they lacked the technical ability to restore from backups (though we don’t know for sure if that’s what happened). And with lax security comes an enhanced risk of your data being obtained by malicious actors.
You may have a point about the obsolescence; my first VA4S got a stuck button about 10 months after purchase. That said, they did replace it with a new refurb for free when I reached out. Likewise, my wife's apple watch battery is getting worse and is only about 1.5 years old and her only option is to buy the latest model or pay $$$ plus enough fees that it's almost the same cost, (certainly not enough examples to generalize, but I've certainly formed my opinions from the experience).
The problem with Garmin is that they sell hardware, and pretty much only hardware. They'll deliberately hold back newer features in software in order to entice you to buy more hardware, because that's how they get their money.
I don't particularly begrudge them that, because as mentioned, it is their only real revenue stream. But it sure would be nice if they didn't.
I am in the same boat with this. I prefer not to have my data tracked, especially my health performance. Currently, I have been doing it the old fashion way using pen and paper and stopping between sets to get my heart rate. It would be much more convenient to not have to, but I haven't found anything that I trust with my data.
Apple Watch keeps your data local, if using iCloud the backup is E2E encrypted
Fittrackee. Self-hosted, open source.
I would have a look at Garmin devices as others have said. I had a swim2 for a few years that my daughter now wears since I got a Descent mk2i. I needed a dive computer with good range on air integration to watch my daughters gas next year when she's old enough to get certified.
As for fitness tracking I have nothing but good things to say, although the few and far between firmware updates are a drag, and I've never seen a new feature unlocked, the fact that the data I get based on the specs I purchased is great, consistent, and the damn things just always work. ___
After a bunch of research and weighing options, I went with a Withings Scanwatch. The 30 day battery time is a nice bonus.
I would check compatibility of Gadget-Bridge (open-source, no internet connection) and then use whatever gadget doesn't require register. My amazfit bip (old version) is basic for gym (not that I need it...) but for hiking I can record the track heart-rate.
i believe one can't stop collection, only aggregation, so use different platforms and different emails - and critically, a device that actually meets your needs - and hope for the best. i have a garmin with an email on a domain i own. my phone is android, using a google profile that's empty of any voluntary info and tied to a gmail address used for nothing else.
it's child's play to aggregate this, but otoh, two companies will work to combine the data only if they have a common goal.
The data can also by aggregated if a 3rd company buys your data from the companies that collect it, like LexisNexis, WorkNumber, etc. This is actually very common...
I second Gadgetbridge. I moved to an Amazfit GTR 2e from a Fitbit Versa, and i don't miss anything.
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