# Scala Architectural Scale vs Ruler

The clearest difference is review sentiment: Scala Architectural Scale at 87% against Ruler's 33%. Scala Architectural Scale also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). Ruler's advantage is ratings volume (136 vs 24) and iOS requirement (11.0 vs 15.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Scala Architectural Scale sells 1 one-off in-app purchase and Ruler sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Scala Architectural Scale holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Ruler has 136 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 87% of Scala Architectural Scale's written reviews are positive against 33% of Ruler's.

Scala Architectural Scale ships an update every 4 months, Ruler every 7 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Scala Architectural Scale | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (24 ratings)](https://appshunter.io/ios/app/scala-architectural-scale/id1090018333/reviews)** | [4.3 (136 ratings)](https://appshunter.io/ios/app/ruler-measuring-scale/id1449113794/reviews) |
| Number of ratings | 24 | **136** |
| Positive reviews | **86.7% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 32 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Noerah Alvi](https://appshunter.io/developer/1088349320) | [MD KHAIRUL ISLAM](https://appshunter.io/developer/1445424899) |

## 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 |


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-scale/id1449113794)

This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.

**Highlights:** Augmented reality measurement, Measure length and area, High precision with AR Kit, Unlimited measurements (premium), Ad-free experience (premium), Subscription options available

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler Premium Weekly | $1.99 | per 7 days |
| Ruler Monthly Premium | $5.99 | per month |


## Frequently asked questions

### Is Scala Architectural Scale free?

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

### Is Ruler free?

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

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

Scala Architectural Scale is rated higher. Scala Architectural Scale averages 4.6 out of 5 from 24 ratings, while Ruler averages 4.3 from 136 ratings.

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

Ruler shows ads; Scala Architectural Scale does not.

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

Scala Architectural Scale ships an update every 4 months, and Ruler every 7 months. Most recently, Scala Architectural Scale was updated on October 26, 2026 and Ruler on October 24, 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.*