Sleep Ledger: Debt Tracker

Are you running on a sleep deficit?

Sleep Ledger reads your Apple Health sleep data to calculate how much sleep you owe your body — and builds a personalized, day-by-day recovery plan to help you pay it back.

WHAT MAKES SLEEP LEDGER DIFFERENT

Unlike other sleep apps that drown you in data, Sleep Ledger gives you two things: a number (your sleep debt) and a plan (when to go to bed tonight).

- Quality-Weighted Debt Score
Not just hours — Sleep Ledger uses Apple Watch sleep stage data (Deep, REM, Core) to calculate how effective your sleep really was. Six hours of deep, restorative sleep counts differently than eight hours of restless tossing.

- Calendar Recovery Plan
See exactly when you'll be debt-free. Sleep Ledger generates a day-by-day schedule with recommended bedtimes, adjustable for late nights and per-weekday wake times.

- Lock Screen, Home Screen & Apple Watch Complications
Your debt balance and tonight's bedtime — always one glance away on your lock screen, home screen, or watch face, without opening the app.

- Private by Design, On-Device Processing
No account creation. No analytics SDKs. No advertising code. No third-party trackers. Your sleep, heart rate, and HRV data is processed entirely on your device. The only network request happens when you choose to send us feedback from Settings → Contact, and the diagnostic details are shown in the form before you send them.

HOW IT WORKS

1. Download and grant read access to Apple Health sleep data.
2. Sleep Ledger analyzes your past 14 days of sleep history.
3. See your current sleep debt balance instantly.
4. Follow your personalized recovery plan to reach zero debt.

FEATURES

Free:
- Sleep debt calculation (14-day rolling window)
- Recommended bedtime based on your wake time and current debt
- Manual sleep entry (add, edit, delete nights)
- Lock Screen widgets (debt balance & recovery gauge)
- Home Screen widget, Small (debt balance + days to zero)
- Apple Watch complications (circular gauge, rectangular, corner)
- Bedtime reminder and morning summary notifications
- Siri Shortcuts (check debt, get bedtime, last night summary)
- Works with or without Apple Watch (enhanced with Watch)
- English, Japanese, German, French, and Korean

Premium:
- 14-day debt trend charts
- Day-by-day recovery plan with target zero-debt date
- Quality-weighted debt score (sleep stages + HRV)
- Sleep stage breakdown (Deep / Core / REM stacked chart)
- Home Screen widget, Medium (debt · last night · bedtime)
- CSV data export (date, duration, stages, HR/HRV)

ABOUT SLEEP DEBT

Sleep debt is the gap between the sleep your body needs and the sleep you actually get. Research shows that accumulated sleep debt affects energy, mood, focus, and long-term health. The good news: you can pay it back. Sleep Ledger shows you how.

PRICING

Sleep Ledger is free to download. Core features — today's debt balance, tonight's bedtime recommendation, manual sleep entry, Lock Screen widgets, Apple Watch complications, and Small Home Screen widget — are always free. Premium unlocks the full recovery plan, sleep trend history, quality-weighted scoring, sleep stage breakdown, Home Screen Medium widget, and CSV data export. Annual plan includes a 2-week free trial.

PRIVACY

Sleep Ledger contains zero analytics SDKs, zero advertising code, and zero third-party trackers. Your sleep, heart rate, and HRV data is processed entirely on your device — it never leaves your iPhone. The only network request is triggered when you tap Settings → Contact to send feedback, and the full diagnostic payload (iOS version, device model, app version, HealthKit fetch status, Premium status) is visible in the form before you send it. We believe your health data belongs to you and only you.

Note: Sleep Ledger is a general wellness app. It is not a medical device and is not intended to diagnose, treat, or prevent any disease. Consult a healthcare professional for medical concerns.