Still useful – CityTransit - Official NYC Subway Maps Review

Been using this app for years and it still does the trick. Not happy, on principal, that Manhattan is incomplete on the bus and bike maps. I'm sure people in the outer boroughs are likewise disappointed with their lack of representation. Full bus maps would go along way, as would route plotter that determined transfers, schedules, travel times, etc. (with no network connectivity) That said this is the app I use when I need to check where a subway line does/doesn't go. And that's usually when I'm on the train.
Review by AnchYou on CityTransit - Official NYC Subway Maps.