# Convert vs Scala Architectural Scale

The clearest difference is rating: Convert at 5.0 against Scala Architectural Scale's 4.6. Convert also leads on update cadence (every 5 weeks vs every 4 months) and iOS requirement (8.0 vs 15.6). Scala Architectural Scale's advantage is review sentiment (87% vs 60%) and ratings volume (24 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Convert sells 2 one-off in-app purchases and Scala Architectural Scale sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Convert 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. Written reviews complicate that: 60% of Convert's written reviews are positive against 87% of Scala Architectural Scale's, so the app with the better star average is not the one people write more warmly about.

Convert ships an update every 5 weeks, Scala Architectural Scale every 4 months. The most recent releases landed on October 14, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Convert | Scala Architectural Scale |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/convert-units-converter/id433833965/reviews)** | [4.6 (24 ratings)](https://appshunter.io/ios/app/scala-architectural-scale/id1090018333/reviews) |
| Number of ratings | 1 | **24** |
| Positive reviews | 60.0% of reviews | **86.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | Free | Free |
| Size | 14 MB | 1 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Toutdanslapoche](https://appshunter.io/developer/432521152) | [Noerah Alvi](https://appshunter.io/developer/1088349320) |

## What reviewers say

### Convert

[App page](https://appshunter.io/ios/app/convert-units-converter/id433833965)

Perform common conversions for length, area, volume, angle, and scales with a modern, efficient interface. Save your preferences and access a history of calculations for quick retrieval. Customize the app's appearance to suit your style.

**Highlights:** Common unit conversions, Custom scale conversions, Saved conversion preferences, Conversion history, Customizable interface colors, Supports luminance conversions

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | one-time |
| Premium Version | $0.99 | one-time |


### 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 |


## Frequently asked questions

### Is Convert free?

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

### Is Scala Architectural Scale free?

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

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

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

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

Neither Convert nor Scala Architectural Scale shows ads.

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

Convert ships an update every 5 weeks, and Scala Architectural Scale every 4 months. Most recently, Convert was updated on October 14, 2026 and Scala Architectural Scale on October 26, 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.*