This is a basic map of Tokyo rail lines but it does not have a key to the different lines by color and letter so is virtually impossible to use. I did use it as an adjunct to another map that did have the key as this shows the lines fairly clearly once you can figure out which is which. If you only want one map, don't bother with this one.

This is the fourth app I downloaded to help navigate my way the Tokyo metro transportation system. I deleted the rest and kept this one because it does show only the subway lines and stops but also shows the JR lines. This made it a lot easier to find my way without having to bug other commuters to ask for help. I couldn't find some stops with the other apps.

Great app. Ads super annoying, but a very useful app if you have a solid internet connection. Downloaded the pay one and was even better w/or internet connection.

很实用

Better than any paper map I could find in Tokyo.

This app crashes just seconds after opening. I deleted it and uploaded it again and it still crashes. I cannot even give it a proper review because of the crashing problem.

I just moved to Tokyo and I'm so glad to have this useful rail/subway map to help me navigate this megalopolis!

Simple and nice but I wish that it would let you zoom in more. The Japanese characters are too small and even the English isn't all that much better. Overall, though, I think it's very good.

This app does exactly what it says it does. I've been in Tokyo for three months now and I'd be lost without it. The colors all correspond with the trains making it easier to find your line, especially in the larger stations like Shinjuku. The search feature is simple and awesome. Launches quickly, never crashes, does its job and does it well. Definitely recommend it to anyone new to Tokyo.

The best app!