There are a number of new features that need to be beta-tested on different devices. If you would like to participate, please get in touch or send an email from within the app (press the (i) button). You will need to be running iOS 11. Please mention which iOS devices you plan to use.
We are using Apple's TestFlight service which makes it simple for you to install the app and to provide feedback.
Supports numbers with up to 38 significant digits.
Real numbers, binary numbers, lists, arrays or vectors, names, and strings.
The display expands to see up to 16 levels at a time. You can easily scroll through and select your entries.
RPN 28x Calc is a 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 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.
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.
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.
The side panel has a keyboard and three pages of commands. You can swipe across the panel to navigate between the pages.
Tap an operand in display to select it. Then issue a command on the selected operand.
From the info menu within the app, you can download the user guide with an introduction and a command reference.
You can restore previous stacks with the UNDO command. Using LAST you can get back the most recently used operands.
When you rotate the iPad, RPN 28x Calc re-adjusts its layout to fit the available screen area.
No interruptions. RPN 28x Calc does not display ads. There are no rating requests.
Sign-up opened for beta-testing of the next version (see info box at the top of this page).
Version 2.1 adds action buttons to the command log. New command: ≠ and aliases: CHS, SQRT, and ==.
Version 2.0 adds a log and variable viewer.