The Offline Line Maps app for Barcelona public transport is a useful tool for both visitors and residents of the city. It provides a complete set of offline maps for metro, railway, bus, ferry, airport, and subway, all sourced from the TMB. With no internet connection required, users can easily zoom in, zoom out, and scroll around the maps.

This app is particularly helpful for those who are new to the city or are unfamiliar with the public transport system. It provides a quick and easy way to navigate the various modes of transportation available in Barcelona. The app is also useful for longtime residents who may need to access the maps offline, such as when traveling underground on the metro.

Supporting indie developers, the app encourages users to send feedback or report any problems via email. Overall, the Offline Line Maps app is a convenient and reliable tool for anyone looking to navigate the public transport system in Barcelona.

In conclusion, the Offline Line Maps app for Barcelona public transport is a comprehensive and user-friendly tool that provides offline maps for metro, railway, bus, ferry, airport, and subway. It is particularly useful for visitors and residents who need to navigate the city's public transport system without an internet connection. The app is easy to use and allows users to zoom in, zoom out, and scroll around the maps. Users are encouraged to support indie developers and provide feedback via email.