Its an app that provides schedule for English, Scottish and Welsh bus services. If you are using a bus service frequently you can add it to your favorites. Then, whenever you come back to the appyou will get the next departure time straight away.
Also, when you find yourself in a not familiar area you can simply launch the app and ask it to show you the nearest bus stops. Once you touch one of them, pick the service and you will get the next departure as well.
Not sure if the bus stops at a stop you want to get off? just click the Route tab
Not sure if it runs tomorrow? just click the calendar icon
Simple as that