Tube - London Underground is a free iPhone application developed by Jing Lau, designed for travel and navigation. It provides real-time information on line statuses, delays, closures, and service changes for the London underground, overground, DLR, tram, and rail. The app features a route planner to find the quickest and cheapest journey, along with maps to navigate the city efficiently. Users can set favorites for quick access, receive real-time updates during disruptions, and access detailed descriptions on service interruptions.

The application offers real-time departure times for all tubes, ensuring users stay informed. With a user-friendly interface tailored to user preferences, Tube - London Underground stands out by providing all these features without any advertisements. This app is a must-have for commuters and travelers navigating London's public transportation system.