InTown shows you which friends are nearby right now, so you can go from "anyone around?" to actually doing something.
No opening the app every hour. InTown runs quietly in the background and taps you when a friend gets within your range. The way it should work.
Choose your radius. Go ghost anytime with no notification sent to anyone. Friends only ever see an approximate area, never your exact location.
I found out three of my best friends were all at the same coffee shop without knowing it. That would never have happened without InTown.
Free on iOS and Android. No subscription, no catch.