Gap Journal: Sleep Diary

Gap Journal is a privacy-first sleep journal and bedtime planner built on the Consensus Sleep Diary (CSD) — the same clinical framework used by sleep researchers and therapists worldwide.

No microphone. No ads. No accounts. No tracking.
Gap Journal has no servers and no accounts of its own. Your journal is stored on your phone, and nothing you log is sent to us or to anyone else. (Android's own device backup is a separate, system-level feature — see "Your Data, Backed Up the Normal Way" below.)

TRACK WHAT MATTERS
- Log intended bedtime vs. actual sleep onset
- Record Wake After Sleep Onset (WASO) in minutes
- Track final wake time and out-of-bed time
- Automatic Sleep Efficiency calculation: (total sleep ÷ total in bed) × 100
- Subjective 1–5 rest rating per night
- Daytime naps and multi-segment days (perfect for shift workers)
- Back-date entries for any missed night with the calendar picker
- Default, Workday and Day Off time presets for one-tap logging — Workday and Day Off learn your usual times

7-DAY TREND CHARTS (FREE)
- Sleep Efficiency line chart with 85% clinical goal reference
- WASO bar chart
- Summary stats: avg efficiency, sleep duration, SOL, WASO
- Export your log as a CSV spreadsheet

GAP JOURNAL PRO — ONE-TIME $4.99, NO SUBSCRIPTION
Upgrade once and unlock everything, forever:

✅ Unlimited History — months of trend data, no 7-day limit
✅ Sleep Debt Tracker — cumulative deficit vs. your 8h/night target
✅ 30-Day Deep Trends — efficiency and duration charts over a full month
✅ Monthly Calendar — colour-coded day-by-day overview (green ≥85%, amber 70–84%, red <70%)
✅ Private Dream Journal — text notes for every night's sleep, kept in the app's own private storage where other apps can't read them
✅ Lifestyle Correlations — track caffeine, alcohol, screen time, medication, and your own custom factors; see how each maps against your sleep quality
✅ Gentle Smart Alarm — a wake-up alarm you can set independently of your bedtime reminder
✅ Ambient Sleep Sounds — white noise and rain, looping offline and still playing after you lock your screen
✅ 4-7-8 Breathing Tool — a guided visual breathing exercise to calm your nervous system before sleep
✅ Optional Health Sync — see step count and heart rate alongside your sleep data, read locally from Android Health Connect
✅ Export Data — PDF Health Record and an AI-ready summary (CSV spreadsheet export is free)
✅ Custom Notification Sound — pick any ringtone from your device for the bedtime reminder

BEDTIME REMINDERS & SMART ALARM
Set a daily bedtime reminder and, with Pro, a gentle wake-up alarm — both fully local. No push servers, no accounts, no tracking.

YOUR DATA, BACKED UP THE NORMAL WAY
Gap Journal doesn't run its own cloud sync — that's the trade-off of keeping your journal off our servers. Your sleep log is still covered by your phone's own Android device backup (the same system that restores your other apps when you set up a new phone), so you're not choosing between privacy and losing your history.

ACCESSIBILITY
Scale all text from 100% to 200% for comfortable reading on any screen. True OLED dark mode for battery savings and night-time comfort.

WHY GAP JOURNAL?
Most sleep apps spy on you with microphones, require accounts, or lock basic features behind monthly subscriptions. Gap Journal does none of that — and it has no servers or accounts of its own, so there's nowhere for your journal to go.

We believe your sleep data is personal health information — and it should stay under your control, not in an app company's database.

Let's fix the gap in the app.

Developed by GapLogic · gaplogicsoftware.com
No data leaves this app on its own. No account required.