Duck!

If you've ever been out and about and seen a plane flying and thought, "That's low!", you can now use the Duck! Apple Watch app to show you nearby aircraft and how high they are above you—if they're nearby and low enough, you might have to Duck!

With its minimal feature-set and basic interface showing the relative altitude of aircraft above you, you can focus on what's important: is the plane actually low? You can also tap on a plane icon to show a brief message about the aircraft type (if available).

Duck! supports zooming out from 1 nautical mile to 3 nautical miles radius, with range rings indicating 0.5 nautical mile steps. You can also pan the view slightly to peek at a plane that might've just flown off scope. And various settings let you customise the duck-titude thresholds.

Duck! necessarily requires access to your location data in order to give you info on surrounding planes and relative altitudes. However your exact location is not sent to plane data APIs: instead it is randomised to a 300m radius.

(Performs API fetches from adsb.lol)