Train Station Alarm
Sleep on the train and get woken before your stop.
Read this before relying on it. A browser tab is paused when it goes to the background, so the alarm only works while this page stays open and in front, with the screen on. Do not lock your phone.
Tap anywhere on the map to drop a pin instead of searching. Map data © OpenStreetMap contributors; search by Nominatim.
On a fast train, 2 km gives you roughly a minute to gather your things.
Private by design. This tool runs entirely in your browser. Your input is processed on your own device and is not uploaded by DO101.
About the Train Station Alarm
Pick your destination, put the phone down, and the alarm wakes you with vibration and sound as you come within range. It runs on GPS alone once armed, so it keeps working in a tunnel or anywhere the signal drops. Built for the very real problem of falling asleep on a Japanese train and waking up three stations too late.
How to use it
- 1Search for your destination station, or tap it on the map.
- 2Choose how far out you want waking — 800 m is a good default.
- 3Press start, keep the tab open with the screen on, and relax.
What you get
- Vibration, a loud repeating chime and a full-screen alert together
- Works on GPS alone once armed — no signal needed
- Live distance, speed, arrival estimate and direction
- Adjustable radius from 300 m to 3 km
- Warns you when the GPS fix is too poor to trust
- Saves your usual stations on the device
- No app to install and no account
Frequently asked questions
Does it work if I lose signal in a tunnel?
Yes. Once you have pressed start, the alarm uses your device's GPS, which does not need a network. The map tiles will not load underground, but the distance countdown and the alarm keep working.
Can I lock my phone or switch apps?
No, and this is the one real limitation. Browsers pause tabs that go to the background, which would stop the alarm. Keep this page open and in front with the screen on — the tool asks for a screen wake lock to help, and warns you if the browser refuses.
Will it vibrate on an iPhone?
No. Safari on iOS does not give web pages access to the vibration motor — that is Apple's decision, not a bug here. On an iPhone the alarm uses sound and a full-screen alert instead, so turn your volume up.
How accurate is it?
GPS is typically accurate to 5–20 m outdoors and much worse between tall buildings or underground. The tool shows the accuracy it is getting and warns you when it exceeds 100 m — in that case choose a larger radius so a drifting fix cannot make you miss your stop.
What radius should I choose?
800 m is a sensible default for a city train. On a fast intercity service pick 2 or 3 km, which gives you roughly a minute to wake up and gather your things.
Is my location sent anywhere?
No. Your position is read by the page and never leaves the device. Station search does contact OpenStreetMap's geocoder when you type a name, but the alarm itself makes no network requests at all.
Does it cost anything?
No. There is no account, no subscription and no app to install.
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