New People Questions! ~~~<3 [Lost?! Confused?! We're here to help!]

Welcome! There is no official app, but there are some good apps made by other users of the platform. Flaming Durtles for android, and Tsurukame for apple seem to be the most popular. There is also Jakeipuu, that came up recently. You can find more info in The New And Improved List Of API and Third Party Apps.