I got a Droid and switched to AB back when the Note 8 was out. Super happy with it. But my profile pic was my first 3 shots at 1000 yards in 20 years, using Ballistic AE, RSO said you should take a pic and I did. Anyway for the few years I used Ballistic AE I was happy with it, but I recommend AB to all my friends, partly so we're all on the same page, but mostly because I trust the app. It adjusts perfectly for the 6500 to 7000 ft of altitude charge from Virginia to Wyoming, checked dope in a 25 mph FV cross wind, spot on. Well, within a minute of rock at 475 yards for 2 shots, last time out to Wyoming.
I remembered Litz's name was mentioned as a input. But after checking site, it looks as though his input was minimal. Only G7 bc's and bullet length library.