Gratuitous–a gratuitous augmented reality app for Windows Phone 7.5

If one would ask what a tip calculator app needed to set itself apart, I suspect very few people would have said an augmented reality restaurant guide.

Andrew Clay Long is however one of the select group who thinks this is exactly what such an app needs, as can be seen in the video above.  His tip calculator also includes a foursquare app and Yelp integration, making it a virtual Swiss army knife of Dining out tools.

If that sounds like exactly what you need, the the non-Mango version can be found in Marketplace here.

Read more at his website here.