Here is a iOS Tab Bar Icon Set, which will help each iPhone or iPad application developer get his GUI in order. The icons from this set can be used in navigation, tab bars and toolbars, as they specifically meet the icon guidelines for iOS applications. Technically, there are 565 unique app icons created in matching style in PNG format with both, black and white versions, in sizes 20x20, 30x30, 40x40, and 60x60 pixels.