TROME

Your next metro, on your lock screen

Walk up to a metro or RER station in the Paris region, and TROME shows its next trains on your iPhone's lock screen, both directions of every line. I am Valentin Furmanek, and I make TROME for my own metro and RER rides, and for other riders. It is open source and not on the App Store yet: follow the launch, or build it with a Mac.

Get it · Help · Aide en français · Privacy · Read the Swift code

• No station to pick. TROME finds the station when you are about 150 metres from it, and takes the trains off your lock screen when you walk away.
• Every line of the station. At a station with many lines, tap the name of the station to see the next line, metro or RER.
• How the trains show. With TROME open, they show when you arrive. With TROME closed, a notification names the station: tap it, and they show while you go down to the platform.
• Not now? Snooze TROME from the lock screen for 30 minutes, an hour, or the rest of the day.
• Your exact position stays on your iPhone. No account and no ads: read what TROME sends, and what it keeps.

Get it on your iPhone

TROME is for iPhones with iOS 18 or later, and it is not on the App Store yet. If you have a GitHub account, watch this repo to hear when it is: Watch, then Custom, then Releases.

Have a Mac? Install TROME on your iPhone yourself with Xcode and a free Apple ID: about an hour the first time, and no Xcode experience needed. You add your own free key from Île-de-France Mobilités for the train times, and you install the app again every 7 days: the guide shows both.

The trains do not show?

Help lists each problem and its fix: the Live Activity does not show, nothing comes when you arrive at a station, or its minutes stop moving.

En français : Aide.

Read or change the code

The app is written in Swift, with SwiftUI and ActivityKit. Its train times come from PRIM, the open data API of Île-de-France Mobilités.

• CONTRIBUTING.md: report a bug, or send your first change.
• ios/README.md: build, run and test the iPhone app.
• server/README.md: the train data server, a Cloudflare Worker.
• docs/README.md: the docs site, and how to write a page.

Licence and data

The code is under the MIT licence. The station list and the train times come from Île-de-France Mobilités, and keep their own licences: NOTICE.md names them, and says what you must do when you reuse them. TROME is not an app of RATP or of Île-de-France Mobilités.