MBTA Transit Tracker is the last app that you will ever need for using the MBTA. It provides you with real-time predictions and vehicle locations pulled directly from the MBTA, giving you the most accurate arrival times possible. Some of the many features are:

- Map views of all subway, bus, and commuter rail stops and routes
- Real-time locations of all subway trains, busses, and commuter rail trains
- Real-time predictions for any stop
- Listing of nearby stops
- Search functionality to find any route or stop
- Offline functionality

And new features added on a regular basis.