# RPN vs Stack RPN Calculator

The clearest difference is review sentiment: RPN at 82% against Stack RPN Calculator's 33%. RPN also leads on rating (4.3 vs 3.5) and ratings volume (15 vs 2). Stack RPN Calculator's advantage is price (Free vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Stack RPN Calculator is free to download; RPN costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN holds the better App Store score, 4.3 against 3.5. That said, the two scores are not equally well evidenced: RPN has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 82% of RPN's written reviews are positive against 33% of Stack RPN Calculator's.

## The numbers

| Metric | RPN | Stack RPN Calculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.3 (15 ratings)](https://appshunter.io/ios/app/rpn-45-sd/id509923051/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697/reviews) |
| Number of ratings | **15** | 2 |
| Positive reviews | **81.8% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Paid | **Free** |
| Size | 14 MB | 10 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Dario Bersiga](https://appshunter.io/developer/668388549) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-45-sd/id509923051)

This app is a detailed simulation of a 1973 scientific calculator, offering a photorealistic interface and all original functions. It includes powerful enhancements for modern use, such as complex number support and advanced date calculations.

**Highlights:** Photorealistic calculator simulation, Full HP-45 function implementation, Complex number support, Advanced date and time functions, Printer simulation for calculation records, Stopwatch functionality, Cut/copy/paste display values

**Features:** macOS Compatibility

**In-app purchases:** none


### Stack RPN Calculator

[App page](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697)

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

**Highlights:** Visible scientific functions, RPN (Reverse Polish Notation) input, Stack display for up to 4 values, Large number storage capacity, Designed for iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Is Stack RPN Calculator free?

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

### Which has better reviews, RPN or Stack RPN Calculator?

RPN is rated higher. RPN averages 4.3 out of 5 from 15 ratings, while Stack RPN Calculator averages 3.5 from 2 ratings.

### Do RPN or Stack RPN Calculator have ads?

Neither RPN nor Stack RPN Calculator shows ads.

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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.*