Enterdeck

An RPL calculator that folds.

Enterdeck is a programmable RPL calculator for iPhone and iPad with an engine of its own: the stack, reverse Polish entry, programs, and the objects that make RPL more than arithmetic, from units and matrices to algebraics and directories. On iPhone Duo it is a pocket RPN machine when closed and a graphing calculator with its manual beside it when open, and folding or turning never changes the stack. ASK writes a program from your words, on the device or with a cloud model using your own key, and look-ups from Wolfram|Alpha arrive as objects you can calculate with. Nothing runs until you run it, every number you read was computed by the calculator, and nothing leaves the device unless you ask: no account, no ads, no tracking.