Pittsburgh Port Authority Bus is a free Android app developed by bigreni that helps public transportation users in Pittsburgh and Allegheny County keep track of bus and light rail schedules. The app allows users to select a route, direction, and stop to see the next bus arrivals. Additionally, users can save their favorite stops to see upcoming arrivals with a single touch.

It's important to note that this is not an official app, and the accuracy of the data is the responsibility of TrueTime, the data owner. However, the app provides a simple and user-friendly interface that is easy to navigate. Overall, Pittsburgh Port Authority Bus is a useful tool for anyone who relies on public transportation in the Pittsburgh area.