RPN 28x Calc 4+
Math can be fun.
tredje design
Designed for iPad
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- $6.99
Screenshots
Description
RPN 28x Calc is a programmable scientific calculator with a pleasingly classic look. Despite its nostalgic appearance, it offers a modern and intuitive user experience, allowing you to interact with your operands by touching them in the display.
It is a reverse-polish notation (RPN) calculator with a dynamic stack display. 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.
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"It’s the third RPN calculator I buy for my iPad 2 and the first that makes me happy.
It’s graphically appealing, intuitive and very responsive. I rated it 5 stars."
(Nuno Gomes)
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Advanced commands are available in a secondary panel on iPad or as alternative button pages on iPhone. The buttons are efficiently grouped into five pages that you can quickly access by swiping left or right:
- user-defined buttons,
- letters A-Z for typing,
- trigonometric, logarithmic, and data manipulation commands,
- statistics, storage and programming commands
- binary integers, system flags and boolean logic.
This is why RPN 28x Calc is unique in its class:
- You can tap a row to select it and issue commands for the selected level.
- In REORD mode, it is possible to rearrange the stack by dragging the rows.
- You can swipe up or down the display to see all levels.
- When you enter a value, you can tap a digit to reposition the cursor.
- Tap on the status indicators in the top of the display to change their state.
- Drag buttons to re-arrange them as you like it (enable that in the settings).
Additionally, on iPad:
- The display automatically resizes to show more than just 4 levels of the stack.
- You can slide the secondary panel out of view or swipe across the panel to navigate between button pages.
New:
- 147 scientific units and elementary physical constants.
- Upper-tail probablity distribution commands.
- Interactive program debugging.
RPN 28x Calc is all you need.
- High precision arithmetics.
- Supports multiple data types: real numbers, complex numbers, binary integers, or lists, arrays, vectors, matrices, programs, names, and strings.
- Name your own variables; inspect them in the variable viewer.
- Use the rich command set to write your own programs.
- Create buttons for your programs.
- Interactive button reordering.
- Browse all scientific units and constants in the units viewer.
- View the command history and the results in the log viewer.
- Customizable button click & alert volumes.
- Support for landscape orientation.
- Optional thousand separators.
- Haptic feedback on iPhone.
- External keyboard support.
- Dark Appearance since iPadOS 13 or iOS 13.
- Alternative, dark app icon.
- Use the same app on iPad or iPhone.
- Use the calculator in iPad multitasking, i.e. in a Slide Over view or in Split View.
- No ads, no tracking, and no rating requests.
- Downloadable user guide with introduction and command reference (PDF).
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Plans for future versions (NOT YET SUPPORTED):
- Arithmetic expressions.
What’s New
Version 3.5.4
- Prevents the assistant window from being hidden whan transitioning from Slide Over or Split View into Full Screen mode.
- Corrects the factorial of zero: 0! = 1.
Ratings and Reviews
My favorite Calc app and I’ve tried many
I grew up using a real HP32, so perhaps I’m biased towards this interface, but I love using this calculator. It provides the best balance between being a traditional RPN calculator and maximizing the benefits of the smartphone I’ve seen. Most of the straight HP calculator emulators use the original display, which has, at most, 4 visible numbers in the stack. Why? That’s a silly limitation on a smartphone. This app also lets you do actual drag and drop on the stack so you don’t need to be adept at ROLL and ROLLD commands. Bonus binary conversions, etc. Most RPN calcs that aren’t based on an original HP architecture just don’t implement RPN well —including the “new” HP Prime (which I own and don’t consider a traditional HP). I encourage you to skim the manual. This app has so many features that you can get lost. I use, at most, 10% of the features, and would not have found my favorites by randomly pushing buttons.
A power-user delight!
I use this calculator a lot when breadboarding circuits, and I’ve added a whole bunch of custom
buttons tied to functions that calculate values related to the ICs I’m using, eg. voltage regulator feedback resistors, current setting resistors, “quick” filters, inductor/capacitor ripple, type II and III compensators, etc. It is a little marvel. Somehow, this button-based RPN interface really makes it work on a touch screen, whereas various other “mobile” interfaces that try and exploit fancier controls fall way short of the promise. This one has just the right mix of plain “buttonery” and screen gestures. I like it better than the thing it’s emulating. I know, what a travesty, but there you go.
If only phone batteries lasted as long as calculator batteries. But as far as this app goes, it seems to do everything right and is a battery-miser. The rest is on Apple to improve :)
HP Calculator fan
My electrical engineer dad gave me his HP 45 to use in middle school when he no longer needed it. As a birthday present from Service Merchandise, my parents gave me a new HP 41CV. It carried me through High School, College and Grad school. I still have it. The 41CV is in a safe place. The HP 28c/s came out in college but I couldn’t justify the cost. I have most of the HP emulators on my iPhone. This is by far my favorite. It utilizes the screen better then any other HP calculator app. It doesn’t over load the screen keys with too much information. It allows the alternative key functions to by swiped to become active. The user can select more easily the key needed. The colors of keys and output display are contrasting which makes using the calculator a joy. Haptic feed back is awesome too.
Finally, a right swipe brings up a blank keyboard area you can populate with custom keys/variables/functions.
This is the RPN calculator app HP would release. It is better then a physical calculator. It does not try to be a physical calculator it uses the strength of an iPhone/iPad screen to make it more usable and user friendly.
You can’t go wrong with this app. Keep up the great work.
App Privacy
The developer, tredje design, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Information
- Seller
- Eric Roller
- Size
- 3.3 MB
- Category
- Productivity
- Compatibility
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- iPhone
- Requires iOS 12.4 or later.
- iPad
- Requires iPadOS 12.4 or later.
- iPod touch
- Requires iOS 12.4 or later.
- Mac
- Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
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English
- Age Rating
- 4+
- Copyright
- © 2013-23 tredje design - Eric Roller
- Price
- $6.99
Supports
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Family Sharing
Up to six family members can use this app with Family Sharing enabled.