Precision timing anywhere. Crossing time zones should not mean recalculating when to wake up — set the alarm in the time zone you are actually thinking in.
Built for aircrew and frequent flyers, and useful to anyone whose day spans zones.
Set an alarm directly in the time your roster or itinerary is written in. No mental arithmetic, and no need to touch your device’s own clock.
Synced to internet time servers rather than trusting the handset, and it tells you plainly when it is running on the device clock instead.
Plans rest windows across a sector and refuses to draw one that will not fit, rather than quietly producing a window that is wrong.
Works out block, airborne, day and night time from the times you already write down, with the day–night split calculated from the sun.
| Price | Free |
| Current version | 2.4 |
| Platform | Android, installed from the APK below |
| Formerly | Sky Alarm, then Sky Matrix Clock — same app throughout. It updates in place over an existing install, and the old SkyAlarm.apk link still serves the same file. |
| Data | Everything stays on your device. |
Verify what you downloaded. The SHA-256 of the current build: