Blood Oxygen tracking is back on the Apple Watch in the US, but it's now a two-device experience

• Following an 18-month ban, Blood Oxygen tracking is coming back to the Apple Watch Series 9, Series 10, and Ultra 2
• It's not an entirely on-device experience anymore, though
• The Apple Watch still measures Blood Oxygen, but the iPhone will calculate and display the final result

It’s been a long 18 months, but Apple’s announced that Blood Oxygen tracking and monitoring are returning to the Apple Watch Series 9, Series 10, and Ultra 2 in the United States.

The feature was disabled and effectively banned on the Series 9 and Ultra 2 – then the Series 10, which launched later – after a ruling in January 2024 due to a patent dispute over the technology being used between Massimo and Apple. Now, thanks to iOS 18.6.1 and watchOS 11.6.1, which will roll out later today, the feature is returning in ...