CityBus Sumy is a free Android app that provides smart online tracking of public transport in Sumy. The main function of this app is the transport tracking that depends on the functioning of an external source of GPS data. The cooperation of the source and app is not guaranteed, and there may be some differences between the real transport position and the one shown in the application due to significant intervals of data updates.

The app filters data to show only actual information and gives users the possibility to save favorite routes lists and apply them in just a couple of taps. On map zoom-in, users can see all vehicles equipped with GPS trackers, not only of selected routes. The app also offers a route search feature where users need to choose two points on a map, and search results could be filtered and applied to display suitable vehicles. The app provides real-time transition and displays movement on a map that is animated, with almost no jumps. Additionally, the app includes traffic optimization, speed and heading visualization, and color routes identification, making it easy to distinguish routes by their number and color of the marker.