# Model Scale Calculator vs Scale Ruler

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

Both are free to download. Scale Ruler sells 1 one-off in-app purchase. Model Scale Calculator asks for nothing beyond the download.

## The numbers

| Metric | Model Scale Calculator | Scale Ruler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Size | 4 MB | 7 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Harbor Apps LLC](https://appshunter.io/developer/1519633346) | [佳 赵](https://appshunter.io/developer/6802149278) |

## What reviewers say

### Model Scale Calculator

[App page](https://appshunter.io/ios/app/model-scale-calculator/id6797369448)

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

**In-app purchases:** none


### Scale Ruler

[App page](https://appshunter.io/ios/app/scale-ruler-pocket-ruler/id6802178983)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scale Ruler Pro | $1.99 | one-time |


## Frequently asked questions

### Is Model Scale Calculator free?

Model Scale Calculator is free to download, with no in-app purchases.

### Is Scale Ruler free?

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

### Do Model Scale Calculator or Scale Ruler have ads?

Neither Model Scale Calculator nor Scale Ruler 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.*