GPS Alarm wakes you when you reach a place, not at a time. Drop a pin or search for a spot, choose a zone from 100 m to 5 km, and nap on the train or bus. It uses the iOS alarm system, so it rings through Silent mode and Focus even with the app closed. Up to 20 alarms, a dark map for night trips, no account, and your location stays on your phone. Free download, then a one-time ($7.99) or weekly ($2.49) unlock. iPhone only, iOS 26.1+.