SleepViz records and analyzes sounds while you sleep — snoring, breathing, disturbances — and turns them into a clear visual sleep report. It reads your Apple Health data (sleep stages, heart rate, HRV, SpO₂) to give you full context around each night. Everything stays on your iPhone. No account, no cloud, no subscription. Just open the app, start a session, and wake up to a full breakdown of your night.