It's a quiet alarm for your train stop. You save the stations you go to and turn StopSure on, once. When you're on a train, your phone vibrates as each of your stations comes up — even with the screen off and no signal underground.
Only these rail systems: buses and commuter rail aren't covered.
Open StopSure, pick your city, then your stations: Home, Work and up to three more. Tap Turn on StopSure and allow what it asks for (see the phone sections below). That's it — leave it on. It stays ready between rides, and comes back by itself after your phone restarts.
You can change your stations any time on the main screen, even mid-ride. To change city, use Settings → City; this clears your stations.
No. With Start automatically on trains on (the default), StopSure notices you're on a train a minute or two after it sets off and starts by itself.
As one of your stations comes up, your phone vibrates and a green Next stop card with the station name appears — on top of whatever you're doing, or over the lock screen if your phone is locked. When the train pulls in and the announcement says "This is…", the same card turns red: Arriving.
Tap Got it. That station won't alert again on this ride. If you just stay on, the alert also stops by itself once the train has moved on.
StopSure alerts only at the stations on your list — it doesn't work out your route. Want a reminder where you change trains? Add that station too. After you change, StopSure carries on with the next train.
StopSure listens for the station announcements and follows the timetable in between, so a missed announcement doesn't mean a missed stop: the alert comes when the timetable says your station is just ahead. If the train is running late or early, that alert can come early or late, and express runs, reroutes and timetable changes can throw it off.
StopSure is an aid — please keep an eye on where you are. See the Terms of Use.
No. Everything runs on your phone, so it works deep underground with no signal. It doesn't use GPS or your location. The internet is used only to send a few anonymous usage counters.
No. StopSure listens only during a ride: from when it's sure you're on a train (or you tap Start) until shortly after you get off. The sound is turned into station names on your phone as it comes in, never saved or uploaded. While automatic start is on, Android shows StopSure as allowed to use the microphone, but it isn't listening until you're on a train.
If it ever starts on a bus or in a car, it stops by itself within a few minutes when it hears no train announcements. More in the Privacy Policy.
So the alert can show on top of whatever you're doing, and as a full card over the lock screen when your phone is locked. On Samsung it's called "Appear on top".
The first time you turn StopSure on, it shows only what's still missing.
Then StopSure is on. Refused the microphone twice? Android won't ask again: open App info → Permissions → Microphone and choose Allow.
These brands stop background apps more aggressively, so StopSure needs a few extra switches. When you turn StopSure on, Go to Settings opens StopSure's App info page. Turn on:
On Xiaomi, Redmi and POCO the first two are under Other permissions on the App info page; turn on Show on Lock screen there too.
Press Back to return to StopSure; it carries on from there (it may open App info once more for the battery setting) and turns on. If it isn't on when you get back, tap the switch again.
Where to find autostart. These are in your phone's Settings app (on Xiaomi, the separate Security app), not inside StopSure. "App info" means Settings → Apps → StopSure:
If alerts don't come after the phone has been locked for a while, blocked autostart or background activity is almost always the reason.
Android requires one while an app stays ready in the background. StopSure's is the quietest kind, with no icon in the status bar, and it just says whether StopSure is watching for your train. StopSure never asks to send notifications, so on Android 13 and later you usually won't see it at all.
That's StopSure's silent alarm. One every two hours lets StopSure start itself again if Android has stopped it; during a ride, one is set for when your station is expected, so the alert still comes if the app is stopped mid-ride. It makes no sound. Android may show it as your next alarm, for example on the lock screen or in the Clock app; tapping it opens StopSure.
It's built to be light. Between rides it only checks how the phone is moving, in small batches; the microphone and speech recognition run only while you're on a train.
Yes — free, with no ads, no in-app purchases and no account.