[T]he Bulletflight ballistics calculator, which predicts the trajectory of bullets fired from high-powered sniper rifles by taking into account half a dozen variables including wind speed, distance, outside temperature and altitude.

After digesting all the information, Bulletflight tells you where exactly on the sniper scope you should position your target in order to hit it.

The application is preprogrammed for three kinds of rifle sold by Knight's Armament Company (KAC) of Titusville, Fla., which commissioned and sells the app for $11.99 through Apple's iTunes App Store.