Only the current version so far — new entries appear as the app ships updates.
東京地下鉄時計 is a maps & navigation app by Ihara product with 10+ downloads (about 27 estimated). +1 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “From route searching for Tokyo Metro and Toei lines to displaying the next train and providing arrival notifications, we support your subway travel.”