# RPN vs PrefixCalc

The clearest difference is price: PrefixCalc at Free against RPN's $4.99. PrefixCalc also leads on iOS requirement (12.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

PrefixCalc is free to download; RPN costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | RPN | PrefixCalc |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | — |
| Size | 1 MB | 28 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Steven Davies](https://appshunter.io/developer/1705785558) | [YONAGARE LAB](https://appshunter.io/developer/1810986554) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-calc/id6464329997)

**Features:** Vision Pro support

**In-app purchases:** none


### PrefixCalc

[App page](https://appshunter.io/ios/app/prefixcalc/id6748650037)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $4.99, with no in-app purchases.

### Is PrefixCalc free?

PrefixCalc is free to download, with no in-app purchases.

### Do RPN or PrefixCalc have ads?

Neither RPN nor PrefixCalc 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.*