# Ruler vs Scale

The clearest difference is price: Ruler at Free against Scale's $4.99. Ruler also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). Scale's advantage is rating (4.2 vs 3.7) and in-app purchases (none vs 1). On review sentiment and ratings volume there is nothing between them.

Ruler is free to download; Scale costs $4.99 up front. Ruler sells 1 one-off in-app purchase. Scale asks for nothing beyond the download.

Scale holds the better App Store score, 4.2 against 3.7. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews point the same way: 63% of Ruler's written reviews are positive against 67% of Scale's.

Ruler ships an update every 5 months, Scale every 8 days. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Ruler | Scale |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/ruler-scale-ruler/id919130707/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/scale-o-tron/id1441824327/reviews)** |
| Number of ratings | 3 | **5** |
| Positive reviews | 63.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 8 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 4 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Mizmovac, Inc](https://appshunter.io/developer/1441824326) |

## What reviewers say

### Ruler

[App page](https://appshunter.io/ios/app/ruler-scale-ruler/id919130707)

This app displays various measurement scales for length, including meters and inches. It allows users to set magnification ratios and reduced scales for different applications. Users can calibrate the ruler and adjust PPI settings for accurate measurements.

**Highlights:** Display various measurement scales, Set magnification ratios, Set reduced scales, Measure in meters and inches, Free mode for custom scales, Calibration for accuracy, PPI setting

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide Ads | $0.99 | one-time |


### Scale

[App page](https://appshunter.io/ios/app/scale-o-tron/id1441824327)

This tool simplifies scaling and unit conversions for creators. It offers a vast library of scales and units, allowing for seamless adjustments and precise calculations. Customize the interface to match your workflow and focus on your projects.

**Highlights:** Extensive database of scales and units, Customizable scales and units, Imperial and metric conversions, Fractional and decimal rounding, Conversion history, Customizable buttons

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

**In-app purchases:** none


## Frequently asked questions

### Is Ruler free?

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

### Is Scale free?

Scale costs $4.99, with no in-app purchases.

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

Scale is rated higher. Ruler averages 3.7 out of 5 from 3 ratings, while Scale averages 4.2 from 5 ratings.

### Do Ruler or Scale have ads?

Ruler shows ads; Scale does not.

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

Ruler ships an update every 5 months, and Scale every 8 days. Most recently, Ruler was updated on November 1, 2026 and Scale on November 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*