Metro CN - Beijing Shanghai HK is a travel and navigation application offering offline subway maps for major cities in China, including Beijing, Shanghai, and Hong Kong. Users can access subway maps for cities like Guangzhou, Shenzhen, Chengdu, and more without needing an internet connection. The app provides features such as one-click fullscreen map view, double-click simple zoom, sliding gestures for navigation, user location tracking, and augmented reality support.

Metro Premium, a monthly subscription service priced at US$4.49, offers additional benefits like an ad-free experience and exclusive features. Subscribers are granted a 7-day free trial, after which the subscription automatically renews unless canceled 24 hours before the next billing cycle. Management of subscriptions can be done through the App Store. For detailed terms of use and privacy policy, users can refer to the links provided by the developer.