# Complex RPN Calculator vs Scientific Calc

The clearest difference is price: Complex RPN Calculator at Free against Scientific Calc's $1.99. Complex RPN Calculator also leads on rating (3.9 vs 3.7) and ratings volume (24 vs 3). On review sentiment, update cadence, ads and in-app purchases there is nothing between them.

Complex RPN Calculator is free to download; Scientific Calc costs $1.99 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 3.7. 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 point the same way: 52% of Complex RPN Calculator's written reviews are positive against 50% of Scientific Calc's.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 21, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | Scientific Calc |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/scientific-calc/id456710555/reviews) |
| Number of ratings | **24** | 3 |
| Positive reviews | **51.7% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Free | Free |
| Size | 1 MB | 15 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [Hannes Sverrisson](https://appshunter.io/developer/428851947) |

## 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)


### Scientific Calc

[App page](https://appshunter.io/ios/app/scientific-calc/id456710555)

This utility app provides advanced scientific calculation functions with an intuitive interface. It offers easy access to functions via swiping and large, uncluttered buttons for faster, more reliable calculations. Customize your experience with background options and enjoy extended accuracy for complex computations.

**Highlights:** Swipe-based access to scientific functions, Large, uncluttered buttons, Backspace key for corrections, Copy and paste functionality, Customizable background and display, Extended accuracy calculations

**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 Scientific Calc free?

Scientific Calc costs $1.99, with no in-app purchases.

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

Complex RPN Calculator is rated higher. Complex RPN Calculator averages 3.9 out of 5 from 24 ratings, while Scientific Calc averages 3.7 from 3 ratings.

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

Neither Complex RPN Calculator nor Scientific Calc shows ads.

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

Complex RPN Calculator ships an update every 5 months, and Scientific Calc every 5 months. Most recently, Complex RPN Calculator was updated on October 21, 2026 and Scientific Calc on October 23, 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.*