# Scala Architectural Scale vs ArchMM

The clearest difference is in-app purchases: ArchMM at none against Scala Architectural Scale's 1. ArchMM also leads on rating (5.0 vs 4.6) and update cadence (monthly vs every 4 months). Scala Architectural Scale's advantage is ratings volume (24 vs 1) and iOS requirement (15.6 vs 18.0). On price, ads, monetization model and device support there is nothing between them.

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

ArchMM holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Scala Architectural Scale has 24 ratings behind it against 1, so its average is the more settled of the two.

Scala Architectural Scale ships an update every 4 months, ArchMM monthly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Scala Architectural Scale | ArchMM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (24 ratings)](https://appshunter.io/ios/app/scala-architectural-scale/id1090018333/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/archmm/id6794546326/reviews)** |
| Number of ratings | **24** | 1 |
| Positive reviews | 86.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | Free |
| Size | 1 MB | 6 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Noerah Alvi](https://appshunter.io/developer/1088349320) | [Brandon Davis](https://appshunter.io/developer/1847967091) |

## What reviewers say

### Scala Architectural Scale

[App page](https://appshunter.io/ios/app/scala-architectural-scale/id1090018333)

This app allows users to measure printed architectural and engineering drawings directly on their device. It supports both known and unknown scales, offering fixed and variable scale options for precise measurements. Users can also select secondary units for quick conversions.

**Highlights:** Fixed and variable scale measurement, Supports unknown drawing scales, Secondary unit conversions (metric, decimal feet, feet/inches), Adjustable measurement precision, Extensive scale options for architectural, engineering, and metric drawings

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scala Full Version | $2.99 | one-time |


### ArchMM

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

This app provides specialized calculation tools for architectural scales, model making, and carpentry. It handles measurements in feet, inches, and fractions, converting them for various design and building projects. Features include board feet calculation, stair layout assistance, and rafter geometry.

**Highlights:** Architectural scale conversions, Model scale to millimeters, Carpenter calculator with dedicated buttons, Board feet calculation, Stair layout and rafter geometry tools, Copy results and multiple appearance themes

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Scala Architectural Scale free?

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

### Is ArchMM free?

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

### Which has better reviews, Scala Architectural Scale or ArchMM?

ArchMM is rated higher. Scala Architectural Scale averages 4.6 out of 5 from 24 ratings, while ArchMM averages 5.0 from 1 ratings.

### Do Scala Architectural Scale or ArchMM have ads?

Neither Scala Architectural Scale nor ArchMM shows ads.

### Which is updated more often, Scala Architectural Scale or ArchMM?

Scala Architectural Scale ships an update every 4 months, and ArchMM monthly. Most recently, Scala Architectural Scale was updated on October 26, 2026 and ArchMM on October 25, 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.*