# ArchMM vs Scale Ruler

The clearest difference is in-app purchases: ArchMM at none against Scale Ruler's 1. Scale Ruler's advantage is iOS requirement (16.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

ArchMM ships an update every 2 weeks, Scale Ruler every 3 weeks. Both last shipped on October 9, 2026.

## The numbers

| Metric | ArchMM | Scale Ruler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 6 MB | 5 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Brandon Davis](https://appshunter.io/developer/1847967091) | [佳 赵](https://appshunter.io/developer/6802149278) |

## What reviewers say

### ArchMM

[App page](https://appshunter.io/ios/app/archmm/id6794546326)

**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, Vision Pro support

**In-app purchases (1)**

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


## Frequently asked questions

### Is ArchMM free?

ArchMM 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 ArchMM or Scale Ruler have ads?

Neither ArchMM nor Scale Ruler shows ads.

### Which is updated more often, ArchMM or Scale Ruler?

ArchMM ships an update every 2 weeks, and Scale Ruler every 3 weeks. Most recently, ArchMM was updated on October 9, 2026 and Scale Ruler on October 9, 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.*