RPN 28x Calc Downloads & RevenueRPN 28x Calc · App Store
RPN 28x Calc is #68 in Productivity Paid in Germany and charting in 1 of 30 countries we track.
Updated 10 Nov 2026 · rankings refresh through the day
Developertredje design
CategoryProductivity
Price7.99 EUR
Released
Rating★ 5.0 (8)
Version3.5.4
Age rating4+
First seen by us
28 Sep 2026
28 Sep 2026Installs (est.)1k+ worldwide
📈Entered the top 100📈Charting in a new country🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 5 events in the last 12 months
- 📈RPN 28x Calc entered the top 100Top Paid · Productivity · DE
- 📈RPN 28x Calc charting in a new countryGermany
- 📈RPN 28x Calc entered the top 100Top Paid · Productivity · SE
- 🆕RPN 28x Calc first spotted by AppInsider#71 in Top Paid · All Apps · Sweden
- 🆕RPN 28x Calc released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
8 ratings
Measured
Best rank now
#68
Productivity PaidMeasured
RPN 28x Calc on the App Store
App details
App ID
529927583
Publisher
Eric Roller
On the store since
May 2012
14 years on the store
Minimum OS
iOS 12.4+
iPhone 5s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
3 MB
Also listed in
Utilities
RPN 28x Calc downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where RPN 28x Calc's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Germany | ProductivityPaid | #68 |
Apps near RPN 28x Calc on the chart
Productivity Paid, around #68.
Ratings
App Store, worldwide.
Rating
5.0 ★
8 ratings
Measured
Ratings
8
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
5.0★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Productivity apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About RPN 28x Calc
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.
-----
"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)
-----
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 in
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.
-----
"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)
-----
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 in
Latest updates
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.
