# Soap Lye Calculator vs MetricSmith

The clearest difference is price: MetricSmith at Free against Soap Lye Calculator's $3.99. MetricSmith also leads on update cadence (every 4 days vs every 3 months). Soap Lye Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17.6). On ads and device support there is nothing between them.

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

Soap Lye Calculator ships an update every 3 months, MetricSmith every 4 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Soap Lye Calculator | MetricSmith |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 34 MB | 15 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jelmer van Nuss](https://appshunter.io/developer/1880809991) | [Bamuda Corporation Pty Ltd](https://appshunter.io/developer/395135697) |

## 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


### MetricSmith

[App page](https://appshunter.io/ios/app/metricsmith/id6778029822)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MetricSmith Life Access | $6.99 | one-time |


## Frequently asked questions

### Is Soap Lye Calculator free?

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

### Is MetricSmith free?

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

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

Neither Soap Lye Calculator nor MetricSmith shows ads.

### Which is updated more often, Soap Lye Calculator or MetricSmith?

Soap Lye Calculator ships an update every 3 months, and MetricSmith every 4 days. Most recently, Soap Lye Calculator was updated on October 31, 2026 and MetricSmith on November 5, 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.*