The Citybus mobile app offers several useful features for bus commuters in Hong Kong. One of the main functions is the Next Bus Arrival Time Enquiry, which provides the estimated time of arrival for the next three buses on various routes, including Citybus, KMB, Long Win, New Lantao Bus, and Green minibuses. It also displays the actual distance between the current location of the bus and the selected stop, and alerts users of any delays or disruptions.

Another feature is the Nearby Route search, which allows users to find the estimated time of arrival for all franchised buses and minibuses within a 400-meter radius of their current or selected location. The app also allows users to bookmark frequently checked routes and displays them at the top of the list for easy access.

The app also includes a Find Nearby Bus Stop on map feature, where users can click on a bus stop on the map to see all the routes that call at that stop and the estimated time of arrival for the next bus. Additionally, the app offers a powerful bookmark function that allows users to retrieve the estimated time of arrival for their desired routes and bus stops. Users can also receive push notifications for route-specific customer notices and special arrangements.

Overall, the Citybus mobile app provides a range of features to enhance the bus commuting experience in Hong Kong. From providing real-time bus arrival information to offering route search and bookmarking functions, the app aims to make it easier for users to plan their journeys and stay informed about any disruptions or changes in the bus services.