# Complex RPN Calculator vs SwiftRPN

The clearest difference is rating: SwiftRPN at 5.0 against Complex RPN Calculator's 3.9. Complex RPN Calculator's advantage is ratings volume (24 vs 1) and update cadence (every 5 months vs every 14 months). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SwiftRPN holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 1, so its average is the more settled of the two.

Complex RPN Calculator ships an update every 5 months, SwiftRPN every 14 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | SwiftRPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swiftrpn/id6470951024/reviews)** |
| Number of ratings | **24** | 1 |
| Positive reviews | 51.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 14 months |
| Monetization | Free | — |
| Size | 1 MB | 3 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Patrick Gelvin](https://appshunter.io/developer/1573354051) |

## 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)


### SwiftRPN

[App page](https://appshunter.io/ios/app/swiftrpn/id6470951024)

**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 SwiftRPN free?

SwiftRPN is free to download, with no in-app purchases.

### Which has better reviews, Complex RPN Calculator or SwiftRPN?

SwiftRPN is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while SwiftRPN averages 5.0 from 1 ratings.

### Do Complex RPN Calculator or SwiftRPN have ads?

Neither Complex RPN Calculator nor SwiftRPN shows ads.

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

Complex RPN Calculator ships an update every 5 months, and SwiftRPN every 14 months. Most recently, Complex RPN Calculator was updated on October 21, 2026 and SwiftRPN on October 24, 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.*