# Complex RPN Calculator vs Complex Conjugate Calculator

The clearest difference is update cadence: Complex Conjugate Calculator at every 6 days against Complex RPN Calculator's every 5 months. Complex Conjugate Calculator also leads on iOS requirement (13.0 vs 16.4). 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.

Complex RPN Calculator ships an update every 5 months, Complex Conjugate Calculator every 6 days. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Complex Conjugate Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 51.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 1 MB | 40 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Stage Coding](https://appshunter.io/developer/1637068135) |

## 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)


### Complex Conjugate Calculator

[App page](https://appshunter.io/ios/app/complex-conjugate-calculator/id1619685165)

**Features:** macOS Compatibility

**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 Complex Conjugate Calculator free?

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

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

Neither Complex RPN Calculator nor Complex Conjugate Calculator shows ads.

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

Complex RPN Calculator ships an update every 5 months, and Complex Conjugate Calculator every 6 days. Most recently, Complex RPN Calculator was updated on October 21, 2026 and Complex Conjugate Calculator on October 10, 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.*