Apple upgrades health tracking in Watch Series 9, but restricts key app for US models
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Series 9 gains on-device Siri with Health access to securely log health data by voice. This feature is not available on prior Apple Watch models.
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As of January 18, 2024, Blood Oxygen app no longer functions on Series 9 and Ultra 2 sold in the US. The app remains available on Series 8 and below.
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Series 9 features the same ECG app, fall detection, advanced cycle tracking, sleep stages tracking, and more health capabilities as Series 8. Most differences are minor upgrades.
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watchOS 10 brings new health features to all compatible Apple Watch models like mood tracking, live cycling metrics, and an updated Heart Rate app.
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Series 9 starts at $399, while Series 8 and older are often discounted. The Apple Watch SE 2 offers some key health features starting at $249.