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Comment by ayhanfuat | Hacker News Reader

Maybe they are just not reporting it. Sleep apnea detection is probably using blood oxygen levels.

I checked the "Compare" page and it confirms no blood oxygen on Series 10 and Ultra 2. It's basically the one thing the 6 does better.

As the other commenter said it does seem like Apple might have either straight up removed it or is disabling it in software entirely for now.

Comparison page lists the "Blood Oxygen app" for the S6 through S8, but S9 and S10 both just have "-" for that comparison section like the S5 has.

EDIT: Another difference between them is the Vitals App description removing the blood oxygen reference.

S10: "Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration"

S08: "Vitals app featuring heart rate, respiratory rate, wrist temperature, blood oxygen, and sleep duration"

it is likely that they are disabling it in software as it is only missing on the product page for the usa

Good call-out!

Here's a non-US comparison link, for anyone interested:

Patent issue, right?

It was using the accelerometer to detect breaths, or absence, and uses a month's worth of data, so not using O2 at all.

It’s pretty unsexy for Apple to say they’re using their sound recognition tech to listen for snoring.