Thank you so much for updating!!! – Active RPN Calculator Review

I love this app. It was my go-to calculator on many iPhones before IOS 11 stopped supporting 32 bit apps. But I stubbornly left it on my home screen “just in case” and have now been rewarded. Has a great interface. The keys are just the right size. Customizable. Highly recommend.
Review by ClimateGary on Active RPN Calculator.