SleepTracker turns the sleep data you're already collecting into a clear, beautiful picture of your nights — automatically, with zero setup. Open the app and it just works. Wear an Apple Watch to bed and SleepTracker syncs your sleep stages, heart rate, and HRV from Apple Health the moment you open it. No watch? Put your iPhone on the mattress and tap Track Sleep with iPhone — it senses movement and sound to estimate your night. Either way, there's no account, no subscription, and nothing to configure. WHAT YOU GET • Sleep rings — see Sleep, Quality, and Deep at a glance • Full stage breakdown — Deep, REM, Light, and Awake, matched to Apple Health • Bedtime, wake time, time to fall asleep, and sleep efficiency • Readiness, Sleep Fuel, and Recovery scores from your real HRV • Heart rate, HRV, SpO2, and respiratory rate (with Apple Watch) • Smart alarm that wakes you in a lighter phase near your target time • History, trends, and a calendar of every night • Tag what affects your sleep — caffeine, late meals, workouts — and see the impact PRIVATE BY DESIGN Your data stays on your device. Health data is read from Apple Health only with your permission, microphone audio is analyzed on-device and never recorded or uploaded, and nothing is sent to a server. FREE SleepTracker is completely free. No subscription, no ads, no account. Sleep better by understanding your nights — automatically.