MTR Map is a free app developed by AppStr for Android users that offers high-resolution maps of the Hong Kong MTR system without the need for an internet connection. This app is an excellent travel companion for navigating the Hong Kong MTR system. The app features maps for all MTR lines, including Kwun Tong Line, Tsuen Wan Line, Island Line, Tseung Kwan O Line, Tung Chung Line, East Rail Line, Ma On Shan Line, and West Rail Line.

The app is easy to use and offers a simple interface that is easy to navigate. The maps are clear and easy to read, and the app allows users to zoom in and out for a better view of the station layout. Additionally, the app includes a search function that allows users to quickly find the station they are looking for. Overall, MTR Map is an excellent app for anyone traveling to Hong Kong and using the MTR system.