Northcube's app has been on the App Store since 2009 and still sets the reference for phone based tracking. It listens through the microphone, with the accelerometer as an alternative, sorts the night into light, deep and REM, records snoring, coughing and sleep talking, then wakes the sleeper inside a chosen window. Premium runs about $39.99 a year and adds full statistics, snore detection, sleep programs and the SleepGPT chatbot; the free tier keeps basic tracking and the smart alarm.
It suits people who own no wearable, since the phone can sit on the nightstand instead of the mattress. Apple Watch owners feed heart rate and temperature in through Apple Health. Long time users grumble that features once bought outright moved behind the subscription, and microphone tracking reacts to a restless partner or a dog on the floor.
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