The Tokyo Metro app 東京メトロアプリ
Gaijin on the subway
With 330 km divided into a dozen lines, it's not always easy to find your way on the Tokyo subway ... But a new app is here to help you.
Tokyo Metro offers users a new free application "Tokyo Subway Navigation for Tourists." The app instantly provides information necessary for any ride, including lines of Tokyo Metro and those of Toei Tokyo Metro.
It's presentation is basic but effective: a network map and a tool "from ... to ...". Geotagging allows you to find the nearest station, but most of the application works "offline," so your good to go even if you are not connected to the internet.