It is signed with a debug key, so Android will warn you and it cannot be updated over a Play Store install. Use it to try the app, not as your only copy of a flight plan. A signed release goes on Google Play when the app is ready for one.
Four tools that work with the phone in flight mode
They compute on the device — nothing is fetched, so nothing stops working when the signal does. Readings is the one surface that needs an account and a connection.
The whizz-wheel, with its four windows and the same slide-rule maths as the web trainer.
Plan a route, then fly it. Nav log, deviations, and a plan that never changes by itself.
OBS, CDI and the TO/FROM flag, on a needle that behaves like the real instrument.
A CDU-style readout — NAV, FPL, NRST, FUEL and the satellite page.
Three steps, because it is not on the Play Store yet
Android blocks apps from outside the Play Store by default. When your browser asks, allow installs from it — Settings → Apps → your browser → Install unknown apps.
Tap the APK in your notifications or in Files. Android will show you what the app can access before it installs.
If you want to be sure the file is the one we published, compare its SHA-256 against the one printed below.