I find the convergence of phone apps and clubs interesting. This one is from Cobra Golf:
Along with AMP CELL Fairways and Hybrids, COBRA Golf’s Fit N Fly app for iOS and Android devices can help golfers determine what trajectory settings they should be using in their AMP CELL clubs. By inputting how many wedges you play, your longest iron, the distance of your driver and distance of your longest iron, the Fit N Fly app will calculate what clubs you need and what MyFly setting they should be set to in order to achieve the distances you’re missing in your bag.
Download the app: http://www.cobragolf.com/fitnfly