What is the most visually appealing iOS app?

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iOS is renowned for its focus on design and visual appeal. The tools that Apple provides to third-party developers are second to none, and this has resulted in a plethora of fantastic apps. So: what one app is the most attractive, appealing, or best designed on your phone? My personal choice at the moment has to be Paper (the Facebook app, not the drawing app), because of its use of simple gestures and hierarchical design. What’s yours?

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