Complex RPN Calculator vs HP41CV
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Complex RPN Calculator
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
- Complex number support
- Four-level stack
- Polar and rectangular formats
- State persistence
- 10 memory locations
- Scientific calculations
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Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.
HP41CV
Experience the functionality of a classic 90s pocket calculator on your iPhone. This app offers UPN calculation with a basic course for new users. Many core functions are available for free, with advanced features offered as optional upgrades.
- HP-41 CV calculator emulation
- UPN (Reverse Polish Notation) calculation
- Basic UPN course with examples
- Core functions available for free
- Optional advanced features
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The HP-41 CV for your iPhone! The HP-41 CV was the best and handiest Pocket Calculator in the 90íst. (Part of the Apollo missions!) A UPN calculation with the same genial handling is now available for your iPhone. For all users, not familiar with the UPN Concept, a Basic course with examples is included. The most functions of the HP 41 CV are available free. In addition statistic functions, programmability, persistent Key assignment and new functions like printing will be available as option.
Screenshots
Verdict
The clearest difference is rating: Complex RPN Calculator at 3.9 against HP41CV's 2.8. Complex RPN Calculator also leads on review sentiment (52% vs 12%) and update cadence (every 5 months vs every 73 months). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Complex RPN Calculator holds the better App Store score, 3.9 against 2.8. Both are backed by a comparable volume of ratings — 24 and 22 respectively. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 12% of HP41CV's.
Complex RPN Calculator ships an update every 5 months, HP41CV every 73 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | Complex RPN Calculator | HP41CV |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (24 ratings) — better | 2.8 (22 ratings) |
| Positive reviews | 51.7% of reviews — better | 11.8% of reviews |
| Number of ratings | 24 — better | 22 |
| Update frequency | Every 5 months — better | Every 73 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | John Coddington | Jurgen Anton Strohmer |
Customer experience
Complex RPN Calculator
HP41CV
Bugs and requests
Complex RPN Calculator
Reported bugs
6 issues- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)
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- Unreadable fonts on iPad (historical version 1.2 issue)
Requested features
24 requests- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)
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- Improve SwiftUI design (less whitespace)
- Show all stack levels
- Add angle function
- Add magnitude function
- Add 'Clear X' button
- Make RAD/DEG toggle button
- Single button for Sci/Eng/Fix/Raw modes
- Add '//' (parallel) function
- Add 'Module' button
- Change 'i' to 'j' for imaginary part
- Show stack levels
- Add log2 function
- Add logGamma function
- Smaller buttons
- Add complex conjugate button
- Add real part button
- Add imaginary part button
- Add modulo function
- Make app start faster
HP41CV
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Complex RPN Calculator
No in-app purchases
HP41CV
No in-app purchases
