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"What do Calcutipr and Gratuitous have in common? They are both tip calculators. Yet what seems like a simple thing shows amazing diversity on the App Store, with well over 3 dozen tip calculators available. What makes these two different from the rest? I have no idea, not having tested the dozens of other options available.But I can tell you choosing a tip calculator has now become largely one of personal preference. Calcutipr (iTunes link), for example, has a sleek and functional interface with lots of options. You can hit a button to round up, for example. Gratuitous (iTunes link), on the other hand, is more \"designed\" and streamlines functions like splitting a bill. Both do the same thing, but in different ways and with different options. Tip calcs are like shoes: they all do essentially the same thing, so your decision boils down to what you like and what you'll pay. Calcutipr is free and Gratuitous is $1.99, which may make the decision a simple one for some. Both work on iPhone and iPod touch.I don't know if you'll like either one of these, but they do the job. If you don't like them, you have plenty of other options (iTunes link)."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/07/10/wwdc-demo-two-tip-calculators/>