tredje design - Eric Roller - RPN 28x Calc - programmable, scientific calculator for iPhone and iPad

RPN 28x Calc

Math can be fun.

Beta-Testing Closed

A big "thank you", to everybody who participated in beta-testing the next version. The testing phase is now closed.

Since there were two testers who have provided the majority of all valuable feedback, I decided to have them share an award in form of AooStore/Amazon/similar gift vouchers of their choice. Congratulations, and thank you!

Stockholm, 2018-11-11.

High Precision Arithmetics

Supports numbers with up to 38 significant digits.

Multiple Data Types

Real numbers, binary numbers, lists, arrays or vectors, matrices, names, strings and programs.

Interactive Stack Display

On iPad, the display expands to fill the screen. You can easily scroll through and select your entries.

RPN 28x Calc

RPN 28x Calc is a programmable scientific calculator with a dynamic stack display. It uses reverse-polish notation (RPN) for its operation.

As you add more values to the stack, the display shown on an iPad automatically expands. To see more lines, simply swipe to scroll. You can also re-order the levels or modify any of the values on the stack.

Programmable

Use the rich command set to write your own programs.

Matric Calculations

Work with large data sets using arrays and matrices.

iPad Multitasking

You can use the calculator in Slide Over or Split View alongside other apps on an iPad.

Variable Viewer (iPad only)

You can browse all variables in a separate viewer. To make a variable available to a command, simply select it in the viewer and issue the command. Double-tap a variable to edit it.

Command & Results History (iPad only)

Select "Log" to display your command history. To place a value back onto the stack, double-tap it. Swipe upwards to reveal a panel of action buttons, i.e. to delete entries or to share the log.

Command Panels

On iPad, the side panel has a keyboard and three pages of commands. You can swipe across the panel to navigate between the pages.

On iPhone, you can swipe across the main button panel to navigate between the pages.

Use the page buttons to go to specific pages quickly.

Work With Operands

Tap an operand in display to select it. Then issue a command on the selected operand.

User Guide

From the info menu within the app, you can download the user guide with an introduction and a command reference.

Download PDF

Multiple Undos

You can restore previous stacks with the UNDO command. Using LAST, you can get back the most recently used operands. With COMMAND, you can get back the most recently typed input.