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.

Zero internet permission. No microphone. No ads. No data tracking.
This isn't just a promise — it's structurally true. Gap Journal doesn't request the INTERNET permission at all, so nothing you log can ever be uploaded, shared, or seen by anyone else, even by accident. Every entry lives only on your device.

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
- Weekday / Weekend time templates for one-tap logging

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

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 — secure text notes for every night's sleep
✅ 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 for as long as your screen is on
✅ 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 — share as CSV Spreadsheet or PDF Health Record
✅ 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 never asking for internet access. 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 unlike apps that merely say they're private, Gap Journal has no internet permission at all, so there's no network connection for your data to leak through even if the developer wanted it to.

We believe your sleep data is personal health information — and it should stay on your phone, not in someone else's database.

Let's fix the gap in the app.

Developed by GapLogic · gaplogicsoftware.com
All data stored locally. No account required.