Simon’s Cat in collaboration with ustwo™ have developed a "very special" iPhone application for Simon’s Cat called Purrfect Pitch.

According to ustwo™: "Purrfect Pitch is a creative musical app and a game. The creative mode allows you to compose your own tunes, save them, and then watch as Simon's Cat sings them back. The game mode sees you taking on the cat himself, as he tests your ability to follow his lead in a series of increasingly difficult musical challenges."

The first Simon’s Cat animation debuted on YouTube in 2008, and has proved a runaway hit with online viewers. With well over forty million hits on YouTube in a little over a year, Simon’s Cat appears to be a genuine word-of-mouth phenomenon.

Available from the Apple iTunes App Store, Simon’s Cat in Purrfect Pitch costs £1.19 and requires the iPhone 3.0 Software Update or later.

Based in London and Malmö, ustwo™ are a creative design studio specialising in pioneering graphical user interfaces that drive the services and products of some of the world's leading brands.

The team behind hit iPhone applications Steppin™, MouthOff™ and The Dot - or simply .™ are currently working with renowned illustrator Jon Burgerman on a new application called inkstrumental™

You can read a detailed ustwo™ profile here.