So much more then I expected
I downloaded the app seeing that it was free and I was in need of a new ballistics calculator. And wow. It pairs amazingly with the BR4 rangefinder and was a big help with getting my rifle dialed for long range. With all of the tools I could need with spin drift and even the Coriolis effect was included as something that can be taken into account. 5/5 recommendations for this a free ballistics calculator.