Launching today
Passby: Location Reminders
Lock-screen arrival alerts for couples. Zero battery drain
3 followers
Lock-screen arrival alerts for couples. Zero battery drain
3 followers
Lock-screen arrival alerts the second you walk past a saved spot. Share pins with your partner, check off errands in 1 tap, with zero battery drain.
Hey Product Hunt! 👋
Setting an alarm for 17:30 to buy coffee beans is pointless when at 17:33 you're probably 4 miles away from the store.
Passby draws a silent circle around the spot, taps your lock screen the moment you enter it, and lets you check it off without unlocking your phone. Share it with your partner—whoever crosses the radius first saves the day.
Why we built it this way:
Zero battery drain: Monitored locally by iOS hardware triggers (0% continuous GPS drain).
Zero-stalkerware: Event boundaries only. Never streams continuous coordinates or movement history across partner devices.
Pure lock screen tactility: Interactive widgets and Dynamic Island let you snooze or complete errands in 1 tap.
Citywide Smart Radars: Autonomous alerts for whichever grocery, pharmacy, or postal drop you encounter first.
Built this over a couple of nights to stop being the reason we're out of coffee. We have coffee now!
Would love your feedback and thoughts.