Apple Watch Series 12 review

The Apple Watch Series 12 is the pick for iPhone owners who care most about one specific disruptor: sleep apnea. Apple lists sleep apnea notifications, intended to detect signs of moderate to severe sleep apnea in people 18 and older without a diagnosis, alongside sleep tracking and a sleep score. The Vitals app collects heart rate, respiratory rate, wrist temperature and sleep duration from the night, so you can spot when something is off, and the Blood Oxygen app adds another overnight reading. All of it lands in the iPhone Health app with the rest of your data. The weak point for sleep is battery: Apple rates the Series 12 at up to 24 hours, or up to 38 hours in Low Power Mode, so you need a charging routine that leaves it on your wrist at night. It also works only with iPhone. At $399 it is the priciest wearable here, but it is a full smartwatch, not just a sleep tracker.

Who it is for

iPhone owners who want a smartwatch that also watches for signs of sleep apnea.

Price

From $399 at Apple's US store when checked.

Apple Watch Series 12 From $399
Quoted from the vendor pricing page on November 8, 2026.

Key features

• Sleep tracking with a sleep score
• Sleep apnea notifications for signs of moderate to severe sleep apnea
• Vitals app with heart rate, respiratory rate, wrist temperature and sleep duration
• Blood Oxygen app
• Low Power Mode up to 38 hours

Strengths and weaknesses

• Strength: Sleep apnea notifications are aimed at adults 18 and older without a diagnosis
• Strength: Fits into the iPhone Health app with all other health data
• Strength: Full smartwatch with apps, payments and safety features
• Weakness: Rated at up to 24 hours of battery, so charging must fit around sleep
• Weakness: Works with iPhone only
• Weakness: Highest verified price among the wearables here

Key facts

• Price: From $399
• Form: Smartwatch
• Battery: Up to 24 hours, up to 38 hours in Low Power Mode
• Sleep metrics: Sleep score, sleep apnea notifications, Vitals
• Phone: iPhone

Where it ranks

Apple Watch Series 12 is No. 7 in our Best Sleep Trackers verdict and No. 1 in Best Smartwatches.