# 定規(Ruler) vs Inch Ruler device size measure

The clearest difference is ads: 定規(Ruler) at none against Inch Ruler device size measure's shown. 定規(Ruler) also leads on iOS requirement (15.6 vs 17.0). Inch Ruler device size measure's advantage is update cadence (every 4 days vs every 6 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

定規(Ruler) ships an update every 6 months, Inch Ruler device size measure every 4 days. The most recent releases landed on June 1, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | 定規(Ruler) | Inch Ruler device size measure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ruler/id1166028258/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 3 MB | 23 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mayumi Kato](https://appshunter.io/developer/705832872) | [Taisuke Hosokawa](https://appshunter.io/developer/1585548762) |

## What reviewers say

### 定規(Ruler)

[App page](https://appshunter.io/ios/app/ruler/id1166028258)

A straightforward measuring tool for iPhones, offering accurate measurements in both millimeters and inches. It's designed for ease of use and provides a cool, functional experience for everyday measuring needs.

**Highlights:** Accurate measurements, Millimeter display, Inch display, Supports all iPhone sizes, Simple interface

**In-app purchases:** none


### Inch Ruler device size measure

[App page](https://appshunter.io/ios/app/inch-ruler-device-size-measure/id6737964962)

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

**In-app purchases:** none


## Frequently asked questions

### Is 定規(Ruler) free?

定規(Ruler) is free to download, with no in-app purchases.

### Is Inch Ruler device size measure free?

Inch Ruler device size measure is free to download, with no in-app purchases.

### Do 定規(Ruler) or Inch Ruler device size measure have ads?

Inch Ruler device size measure shows ads; 定規(Ruler) does not.

### Which is updated more often, 定規(Ruler) or Inch Ruler device size measure?

定規(Ruler) ships an update every 6 months, and Inch Ruler device size measure every 4 days. Most recently, 定規(Ruler) was updated on June 1, 2026 and Inch Ruler device size measure on August 21, 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.*