RPNPro
RPNPro is a calculator for software engineers.
It is based on the RPN (Reverse Polish Notation) entry scheme as known from Hewlett-Packard calculators. It provides a four level stack for variable storage.
RPNPro ist available from the App Store. It adapts automatically to the display size of the iPhone and the iPad.
RPNPro respects your privacy by NOT collecting any personal or usage data.