Best RPN calculator yet! – Active RPN Calculator Review

Fast and responsive without lags in data entry or calculations. Simple, good looking interface has some of the old HP style, without trying to be an exact replica. If you don't need the more esoteric functions most of the time, they can be hidden for a cleaner appearance. Animation of the stack is a nice touch. Good work, but can you make the icon look as nice as the rest of the app? The current one is ugly, IMO. Also, how about a retina display update for iPhone 4?!
Review by RPNtys on Active RPN Calculator.