There’s always that science experiment slice in the back of your fridge, but sometimes you crave pizza that’s hot, fresh, and without mold spores. For those late-night cravings or when you’re in an unfamiliar area, call on the Pizza Compass (99 cents), an application that brings up a map of all the nearby pizza joints. Just pick your place and the app acts like a real compass, with your final destination always ending in savory melted cheese and bread in your mouth.