When you take the subway and there is no internet connection, the app can provide more convenient to view the subway map offline without internet connection.
Many other apps need network connection.

Including China's major metro systems: Shanghai, Beijing, Guangzhou, Chongqing, Shenzhen, Tianjin, Nanjing, Chengdu, Shenyang, Wuhan, Suzhou, Kunming, Changchun, Xi'an, Hangzhou, Harbin, Dalian, Hong Kong, Shijiazhuang Metro, Hefei, Dongguan, Qingdao Metro, Nanchang Subway, Nanning Rail Transit, Xuzhou Metro, Urumqi Metro, Changzhou Metro, Shaoxing, Wuxi Metro, Guiyang, Xiamen Metro, Wenzhou,
Fuzhou Metro, Jinan Metro, Lanzhou.

- Starts quickly, does not take up resources, and automatically release memory when app end.
- High resolution map, Offline view available.
- This app is not an official app of each subway company. If you need to check the ticket or other train information, please install the official APP of each subway.