# SwiftRPN vs CalcStak

The clearest difference is in-app purchases: SwiftRPN at none against CalcStak's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CalcStak sells 1 one-off in-app purchase. SwiftRPN asks for nothing beyond the download.

## The numbers

| Metric | SwiftRPN | CalcStak |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swiftrpn/id6470951024/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | — |
| Size | 3 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Gelvin](https://appshunter.io/developer/1573354051) | [JOEL ANDREW ROSINBUM](https://appshunter.io/developer/1896305700) |

## What reviewers say

### SwiftRPN

[App page](https://appshunter.io/ios/app/swiftrpn/id6470951024)

**In-app purchases:** none


### CalcStak

[App page](https://appshunter.io/ios/app/calcstak/id6766592809)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific Functions | $2.99 | one-time |


## Frequently asked questions

### Is SwiftRPN free?

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

### Is CalcStak free?

CalcStak is free to download, with in-app purchases available.

### Do SwiftRPN or CalcStak have ads?

Neither SwiftRPN nor CalcStak 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.*