Forbes August 17, 2025
Apple just brought blood oxygen tracking back to millions of Apple Watch Series 9, Series 10 and Ultra 2 models, missing since early 2024, when Apple removed it. Here’s what’s happened, how the new app is different, and how to use it.
The option to monitor your blood oxygen was big news when it arrived on Apple Watch Series 6 in 2020.
However, medical equipment manufacturer Masimo sued Apple in a patent dispute and in late 2023, Apple removed Series 9 and Ultra 2 watches from store shelves in the U.S. to comply with the dispute. They later returned with the app removed in early 2024 — though the hardware sensors remained unchanged.
Since the dispute only affected watches imported...
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