# Complex RPN Calculator vs |RPN| Scientific Calculator

The clearest difference is price: Complex RPN Calculator at Free against |RPN| Scientific Calculator's $0.99. Complex RPN Calculator also leads on rating (3.9 vs 2.3) and ratings volume (24 vs 3). |RPN| Scientific Calculator's advantage is update cadence (fortnightly vs every 5 months) and review sentiment (60% vs 52%). On ads, in-app purchases and iOS requirement there is nothing between them.

Complex RPN Calculator is free to download; |RPN| Scientific Calculator costs $0.99 up front. 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 2.3. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 52% of Complex RPN Calculator's written reviews are positive against 60% of |RPN| Scientific Calculator's, so the app with the better star average is not the one people write more warmly about.

Complex RPN Calculator ships an update every 5 months, |RPN| Scientific Calculator fortnightly. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | |RPN| Scientific Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997/reviews) |
| Number of ratings | **24** | 3 |
| Positive reviews | 51.7% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 1 MB | 2 MB |
| Requires iOS | 16.4 | **16** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Bradley Smith](https://appshunter.io/developer/1069467996) |

## What reviewers say

### Complex RPN Calculator

[App page](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330)

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.

**Highlights:** Complex number support, Four-level stack, Polar and rectangular formats, State persistence, 10 memory locations, Scientific calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ Great RPN functionality
- ✨ Complex number support
- 🆓 Free to use
- 🚫 No ads or in-app purchases
- 💻 Works on macOS

**What reviewers complain about**

- 🎨 SwiftUI design is ugly
- 🐌 Slow keyboard response
- 🖱️ Clunky operation
- 📉 Complex number operations limited
- ⚠️ Broken on newer iOS versions (historically)

**Reported bugs**

- 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)

**Requested features**

- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)


### |RPN| Scientific Calculator

[App page](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997)

This calculator app uses Reverse Polish Notation for powerful calculations. It offers customizable color schemes, layouts, and online help, designed for flexibility and usability. All features are unlocked with a one-time purchase.

**Highlights:** Reverse Polish Notation (RPN), Viewable stack, Selectable portrait/landscape layouts, Customizable color schemes, Online visual help, No ads or in-app purchases

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Complex RPN Calculator free?

Complex RPN Calculator is free to download, with no in-app purchases.

### Is |RPN| Scientific Calculator free?

|RPN| Scientific Calculator costs $0.99, with no in-app purchases.

### Which has better reviews, Complex RPN Calculator or |RPN| Scientific Calculator?

Complex RPN Calculator is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while |RPN| Scientific Calculator averages 2.3 from 3 ratings.

### Do Complex RPN Calculator or |RPN| Scientific Calculator have ads?

Neither Complex RPN Calculator nor |RPN| Scientific Calculator shows ads.

### Which is updated more often, Complex RPN Calculator or |RPN| Scientific Calculator?

Complex RPN Calculator ships an update every 5 months, and |RPN| Scientific Calculator fortnightly. Most recently, Complex RPN Calculator was updated on October 31, 2026 and |RPN| Scientific Calculator on November 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*