Skysanner is an app for both iOS and Android that acts a little like Kayak, Hipmunk, or any other service that helps you search multiple travel sites at once. It has a very clean look, with an interactive map, globe and graph to help you compare prices for different airlines. It seems to have raving reviews and a average score of 4.5 stars. So, go check it out for your respective device!
Note: You need iTunes to download the iOS version if you’re using a computer.