Free app that does what you need...

...what more could you ask for?

Simple interface, allows you to see all the routes at all the stations, and can plan your travel for you, all without any data! As someone who was just visiting NYC and doesnt have roaming, that is great.

Has additional features like checking if a certain route is experiencing delays, and even a station finder (never tried it though).

For a free app, its perfect.

Fanwashere about New York Subway MTA Map, v2.5