# Soap Lye Calculator vs SkinStack

The clearest difference is price: SkinStack at Free against Soap Lye Calculator's $3.99. Soap Lye Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17). On ads and device support there is nothing between them.

SkinStack is free to download; Soap Lye Calculator costs $3.99 up front. SkinStack sells 1 one-off in-app purchase. Soap Lye Calculator asks for nothing beyond the download.

## The numbers

| Metric | Soap Lye Calculator | SkinStack |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 34 MB | 1 MB |
| Requires iOS | **15.1** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Jelmer van Nuss](https://appshunter.io/developer/1880809991) | [贺 周](https://appshunter.io/developer/1815397078) |

## What reviewers say

### Soap Lye Calculator

[App page](https://appshunter.io/ios/app/soap-lye-calculator/id6762357300)

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

**In-app purchases:** none


### SkinStack

[App page](https://appshunter.io/ios/app/skinstack/id6763434879)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkinStack Pro | $4.99 | one-time |


## Frequently asked questions

### Is Soap Lye Calculator free?

Soap Lye Calculator costs $3.99, with no in-app purchases.

### Is SkinStack free?

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

### Do Soap Lye Calculator or SkinStack have ads?

Neither Soap Lye Calculator nor SkinStack 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.*