# r.Calc vs Complex RPN Calculator

r.Calc and Complex RPN Calculator both sit at 4.0 stars, but that hides the real split: 100% of r.Calc's written reviews are positive against 52% of Complex RPN Calculator's. r.Calc also leads on iOS requirement (2.2.1 vs 16.4). Complex RPN Calculator's advantage is price (Free vs $0.99) and update cadence (every 5 months vs every 197 months). On rating, ads, in-app purchases and device support there is nothing between them.

Complex RPN Calculator is free to download; r.Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.0 for r.Calc against 3.9 for Complex RPN Calculator. 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 are what separate them: 100% of r.Calc's written reviews are positive against 52% of Complex RPN Calculator's.

r.Calc ships an update every 197 months, Complex RPN Calculator every 5 months. The most recent releases landed on June 10, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | r.Calc | Complex RPN Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/rcalc/id291200623/reviews)** | [3.9 (24 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) |
| Number of ratings | 3 | **24** |
| Positive reviews | **100.0% of reviews** | 51.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 197 months | **Every 5 months** |
| Monetization | Paid | **Free** |
| Size | 0 MB | 1 MB |
| Requires iOS | **2.2.1** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nicolas Jorand](https://appshunter.io/developer/291200626) | [John Coddington](https://appshunter.io/developer/291826333) |

## What reviewers say

### r.Calc

[App page](https://appshunter.io/ios/app/rcalc/id291200623)

A straightforward calculator utilizing Reverse Polish Notation (RPN) for everyday calculations. It offers a four-level visible stack with a total capacity of 100 positions, providing visual feedback on stack fullness. Basic arithmetic operations and stack manipulation functions are included.

**Highlights:** Reverse Polish Notation (RPN) input, Four visible stack levels, 100-position stack capacity, Progress bar for stack fullness, Basic arithmetic operations, Stack swap and recall functions, Vibration feedback for errors

**Features:** macOS Compatibility

**In-app purchases:** none


### 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)


## Frequently asked questions

### Is r.Calc free?

r.Calc costs $0.99, with no in-app purchases.

### Is Complex RPN Calculator free?

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

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

r.Calc is rated higher. r.Calc averages 4.0 out of 5 from 3 ratings, while Complex RPN Calculator averages 3.9 from 24 ratings.

### Do r.Calc or Complex RPN Calculator have ads?

Neither r.Calc nor Complex RPN Calculator shows ads.

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

r.Calc ships an update every 197 months, and Complex RPN Calculator every 5 months. Most recently, r.Calc was updated on June 10, 2026 and Complex RPN Calculator on October 21, 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.*