SleepViz: Sleep Recorder

Record your nights, see your sleep stages and vitals, and wake up to your sleep score. On-device AI detects snoring automatically. 100% free.

SleepViz turns your iPhone into a pocket sleep lab. Place it by your bed, tap Start, and wake up to a full breakdown of your night — with real audio clips of what actually happened and your health data from Apple Watch.

No account. No subscription. No cloud upload. Everything is free, and everything stays on your device.

— WHAT SLEEPVIZ DOES —

• Sleep Score (0–100) every morning, based on what we heard and how long you slept.
• Snore detection with timestamped audio clips you can replay.
• Sleep stages (Deep, Core, REM, Awake) pulled from Apple Health.
• Heart rate, blood oxygen (SpO2), and respiratory rate from your Apple Watch.
• Sleep trends chart so you can see patterns across the week and month.
• Tailored "Why / How Improve" insights based on what was detected.
• 30-day calendar to jump to any past night.

— BUILT FOR REAL NIGHTS —

• Live waveform and live event feed while you record.
• Handles phone calls, alarms and interruptions automatically.
• Crash-safe: if your phone dies mid-night, we recover the session.
• Thermal-aware: warns you if your device is overheating.
• Storage-aware: warns before a full night if space is low.
• Works fully offline. No WiFi needed.

— PRIVATE BY DESIGN —

Your audio never leaves your iPhone. Ever. We don't have servers, we don't stream, we don't sell data. The microphone is only used while you're actively recording, and you can delete everything with one tap in Settings. Health data is read locally from Apple Health — never transmitted.

— WHO IT'S FOR —

• Snorers who want to know how loud, how often, and when.
• Apple Watch wearers who want their sleep stages and vitals in one place.
• Light sleepers tracking what wakes them up.
• Couples settling the "you were snoring again" debate.
• Anyone curious about what their body does between lights-out and morning.

— HOW TO USE —

1. Pick your recording routine (daily or weekly — whatever fits your life).
2. Place your phone near the bed, plugged in.
3. Tap Start. Go to sleep.
4. Tap Stop in the morning and read your report.

— 100% FREE —

No paywall. No trial. No "unlock premium". Every feature — score, audio clips, sleep stages, vitals, trends, insights — is free for everyone, every night.

Sleep better. Know your nights. Own your data.