NimbleBit is an American developer and publisher of iOS and Android mobile apps. Some of their popular titles include Pocket Frogs, Tiny Tower, and Pocket Planes. It was co-founded by brothers David and Ian Marsh.Founder Ian Marsh has accused Zynga of copying its award-winning Tiny Tower game to create Dream Heights. Zynga had attempted to buy NimbleBit, but on refusal, Zynga created Dream Heights.