Drone Master is an amazing app for iPhone 4 or iPod touch 4th generation.
With Drone Master, the AR.Drone clones the orientation and tilt of the iPhone.
Yaw, Roll, and Pitch are all copied exactly on the AR.Drone. This is probably the easiest way to fly your AR.Drone.
Drone Master has easy visual settings for controlling your AR.Drone’s LED lights.
Using on board object tracking, Drone Master allows you to make the AR.Drone follow and track objects.