iPhone 6+

I received a physical quad copter/drone as a gift, and having never been around one had issues flying it. I was hesitant to practice, fearing causing damage to the flyer or persons/animals. I found this app which allows simulated flying in a safe environment with the exact controls my particular model used. After a couple days with the app I was able to fly the real thing with confidence, and within a week was completing flips, spins, fast direction changes, and expert maneuvers. I cant recommend this program enough.

Zero Ehxe about Electric RC Sim