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Numbers, developed by Apple, is an alternative to Microsoft's excel spreadsheet program.
Touch-screen compatible, the Numbers application contains the usual functions of spreadsheet software -- including the ability to input data, create tables, charts, graphics, and to install photos. A useful feature is a connection to iCloud, so you can keep important documents up to date across all of your devices.
This app is compatible with the Phone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch and iPad. Requires iOS 5.1 or later.
Download: Apple App Store