BART Commuter is a one-tap single purpose app for people who commute the same route on the BART daily.
Set your home and work BART stations, and the time it takes to go to the station and the app will generate a list of trains (using real-time train data) that go in your direction and highlight the most recent train that you can take. It will show trains going to work in the morning and trains heading home in the afternoon automatically.