# Complex RPN Calculator vs A Complex Calc

The clearest difference is rating: A Complex Calc at 4.7 against Complex RPN Calculator's 3.8. A Complex Calc also leads on review sentiment (80% vs 52%) and update cadence (every 3 weeks vs every 5 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

A Complex Calc holds the better App Store score, 4.7 against 3.8. Both are backed by a comparable volume of ratings — 22 and 23 respectively. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 80% of A Complex Calc's.

Complex RPN Calculator ships an update every 5 months, A Complex Calc every 3 weeks. Both last shipped on October 14, 2026.

## The numbers

| Metric | Complex RPN Calculator | A Complex Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (22 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[4.7 (23 ratings)](https://appshunter.io/ios/app/a-complex-calc/id1372571548/reviews)** |
| Number of ratings | 22 | **23** |
| Positive reviews | 51.7% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 28 MB |
| Requires iOS | 16.4 | **10.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Antonio Ruffolo](https://appshunter.io/developer/1372571547) |

## 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)


### A Complex Calc

[App page](https://appshunter.io/ios/app/a-complex-calc/id1372571548)

Perform complex calculations with a modern, user-friendly interface. Offers both basic and scientific modes, including support for complex numbers and advanced functions. This lightweight application provides a history of computations and is completely free with no advertisements.

**Highlights:** Complex number support, Basic and Scientific modes, History of operations, Trigonometric and hyperbolic functions, Random number generation, Lightweight app size

**Features:** macOS Compatibility, 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 A Complex Calc free?

A Complex Calc is free to download, with no in-app purchases.

### Which has better reviews, Complex RPN Calculator or A Complex Calc?

A Complex Calc is rated higher. Complex RPN Calculator averages 3.8 out of 5 from 22 ratings, while A Complex Calc averages 4.7 from 23 ratings.

### Do Complex RPN Calculator or A Complex Calc have ads?

Neither Complex RPN Calculator nor A Complex Calc shows ads.

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

Complex RPN Calculator ships an update every 5 months, and A Complex Calc every 3 weeks. Most recently, Complex RPN Calculator was updated on October 14, 2026 and A Complex Calc on October 14, 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.*