London Tube Guide (iPhone, iPad)
Find out how far you are from your nearest stations and the best Tube route to 200 top tourist attractions. As well as giving live service updates, and full A-Z station info, the app taps into a map with disabled access points, and into Google Maps, for planning your walk to the station.
apple.com/itunes; 69p
App of the week: London Tube Guide
Every week, The Sunday Times travel section selects its favourite new piece of clever gadgetry to make your travels happier