YAPL — Yet Another Pilot Log

A private, offline flight logbook for Android.

_{F-Droid listing pending review.}

YAPL is a flight logbook built for professional and general-aviation pilots who want to keep their hours on their own device — no account, no cloud, no tracking, no network access at all. It records flights in a clean EASA/BCAA-style structure and can print a paper-logbook-ready PDF to keep an official book up to date.

Features

• Flight logging — route, block times, aircraft, crew role, day/night landings, IFR and night time. Night time is computed automatically from sunrise/sunset (NOAA solar algorithm) for each leg.
• Logbook view — flights grouped by month with running totals and a fast scrollbar for thousands of entries.
• Statistics — all-time and rolling 90-day totals (time, night, IFR, landings), seeded by your pre-digital previous totals.
• Hangar — your aircraft types and registrations, kept tidy and reusable.
• BCAA / EASA PDF export — generates the official two-page-per-sheet logbook layout with per-page and carried-forward totals. Mark page breaks in the app so the PDF pages line up exactly with your paper book, and export from any date (it snaps back to the first flight of that page).
• Backup & restore — full flights CSV, plus a JSON reference backup of airports, aircraft, settings and previous totals. Import from the legacy Flight Logbook app's JSON export.
• Bundled airport database — 7,697 airports from OurAirports for offline lookup.

Screenshots

Privacy

YAPL declares no Android permissions, has no network code, and bundles no analytics, ads or tracking libraries. Your flight data never leaves your device unless you export it through the Storage Access Framework. File access for import/export is granted per-file by the system picker.

Building

Requirements: JDK 21 and the Android SDK (compile/target SDK 35).

# Debug build (installs as be.moraine.yapl.debug)
./gradlew assembleDebug

# Release build (minified with R8; installs as be.moraine.yapl)
./gradlew assembleRelease

# Unit tests
./gradlew testDebugUnitTest

To sign your own release builds, create a keystore.properties file (gitignored) at the repository root:

storeFile=/absolute/path/to/your.keystore
storePassword=…
keyAlias=…
keyPassword=…

The bundled airport/aircraft database (app/src/main/assets/airports.db) is generated from OurAirports data:

python3 scripts/build_airports_db.py

Architecture

Clean Architecture in three layers:

• domain — models, repository interfaces, use cases (pure Kotlin, unit-tested).
• data — Room database, DAOs, entities, mappers, repository implementations.
• ui — Jetpack Compose (Material 3) screens, view models, navigation.

Dependency injection with Hilt; persistence with Room; dates with kotlinx-datetime. The app ships with a pre-populated SQLite asset copied to the live database on first launch and migrated forward in place.

Credits

• Airport data © OurAirports (public domain).
• Sunrise/sunset from the NOAA Solar Calculator algorithm.

License

YAPL is free software licensed under the GNU General Public License v3.0. You may use, study, share and improve it under the terms of that license.