バスどこ is a travel and navigation application designed for iPhone users, providing real-time information about bus proximity and arrival times. The app allows users to monitor the current location of buses and estimate their arrival, making it a useful companion for daily commutes. Users can easily register their favorite bus stops for quick access, enhancing the overall travel experience.

Key features of the app include bus stop proximity information, traffic-aware route displays, and a bus stop map. Additionally, users can receive real-time notices from certain bus operators. The app supports 18 bus companies across various regions, including Kanto, Kinki, Chugoku, and Kyushu. However, users should note that the app is not an official service from bus operators, and information may not always be fully accurate or timely.