Screen Size
The most obvious difference is the amount of screen space available on the iPad family versus iPhone or iPod touch. iPads have a large 1024x768 point resolution enabling the display of much more content. iPhones and iPod touches have two display geometries: The 3.5-inch screen used by earlier devices is 480x320 points while the newer 4-inch screen is 568x320.
Notice that the above resolutions are in points, not pixels. Most Apple devices now use a higher resolution retina display, doubling the number of available pixels and better matching human vision. Luckily, instead of worrying about whether the device is 480x320 (non-retina) pixels or 960x640 (retina) pixels, you can work in the world of points. For artwork, Xcode makes it easy ...
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