UnderLX: Lisbon Metro is an unofficial app that provides a range of features for those who use the Lisbon subway. The app is still under development, but it already offers a lot of useful information for anyone who needs to get around the city using the subway system.

The app allows users to check the current line status and receive notifications about any service interruptions or delays. It also provides information about the estimated arrival time of the next trains and allows users to see the network map and info about all stations, including connections with other public transport services. Additionally, users can see their location inside the subway network and analyze their trip history. The app also has a trip planning feature that helps users plan their journeys with ease.