Standing on a Japanese platform, unsure if the train in front of you is the right one? Japan Train Boarding Helper is a free web app that lets you select your station and destination, then shows you exactly what your train's display should look like — so you can confirm before you board. Supports major Tokyo-area lines including Keikyu, Meguro, Hibiya, Mita, Sotetsu, and N'EX. No sign-up required. Just open and go.