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When you first set up your iPad most of the apps you have will be for iPhone size screens. Quick way to find those bigger-sized apps is to 1) Go to the iTunes store; 2) Click on the Genius icon at the bottom of the screen; 3) Once the Genius results load, at the top of the screen choose “iPad upgrades” and you’ll be presented with the list of apps that have iPad versions you’re missing.

This isn’t foolproof of course, since app makers may name the iPad versions differently, but it’s a good start.

Apple, Blog,