# 定規(Ruler) vs Ruler 2.0

The clearest difference is review sentiment: 定規(Ruler) at 80% against Ruler 2.0's 30%. 定規(Ruler) also leads on rating (5.0 vs 3.9). Ruler 2.0's advantage is ratings volume (205 vs 2) and iOS requirement (12.0 vs 15.6). On price, update cadence, ads and in-app purchases 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) holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Ruler 2.0 has 205 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 80% of 定規(Ruler)'s written reviews are positive against 30% of Ruler 2.0's.

定規(Ruler) ships an update every 6 months, Ruler 2.0 every 5 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | 定規(Ruler) | Ruler 2.0 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ruler/id1166028258/reviews)** | [3.9 (205 ratings)](https://appshunter.io/ios/app/ruler-20-inch-mm-cm/id1345983397/reviews) |
| Number of ratings | 2 | **205** |
| Positive reviews | **80.0% of reviews** | 29.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 3 MB | 15 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mayumi Kato](https://appshunter.io/developer/705832872) | [Oleg Osipov](https://appshunter.io/developer/1345983395) |

## 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


### Ruler 2.0

[App page](https://appshunter.io/ios/app/ruler-20-inch-mm-cm/id1345983397)

This app provides a precise on-screen measuring tool for your iPhone or iPad. Easily measure length and width in centimeters, millimeters, or inches, with options to save measurements as photos and customize the ruler's appearance. It's designed for accurate, user-friendly measurements.

**Highlights:** On-screen ruler, Measure length and width, Centimeters, millimeters, inches, Save measurements as photos, 3 ruler color options, Manual measurement adjustment

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 💡 Precise measurements (when working)
- ✨ Free with no ads
- ✅ Lightweight and small size
- 🎯 Good for small item measurements

**What reviewers complain about**

- 🐛 Frequent crashes
- 📏 Inaccurate measurements on newer phones
- 📱 Not optimized for high DPI screens
- 📉 Scale is off by ~50% on newer models
- ⚠️ Support link is shady

**Reported bugs**

- Crashes after a few seconds
- Keeps crashing
- Wrong scale/dimension measurement on newer iPhones (13, 14, 15 series, SE 2022)
- Inches are too small (e.g., 1cm shows as smaller than 4mm)
- Measurements are off by about half

**Requested features**

- Update for newer iPhone displays (high DPI)
- Manual adjustment for screen size/resolution
- Add option to manually enter dimensions
- Add inch fractions as measurement option
- Allow adjustable text font size when saving


## Frequently asked questions

### Is 定規(Ruler) free?

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

### Is Ruler 2.0 free?

Ruler 2.0 is free to download, with no in-app purchases.

### Which has better reviews, 定規(Ruler) or Ruler 2.0?

定規(Ruler) is rated higher. 定規(Ruler) averages 5.0 out of 5 from 2 ratings, while Ruler 2.0 averages 3.9 from 205 ratings.

### Do 定規(Ruler) or Ruler 2.0 have ads?

Neither 定規(Ruler) nor Ruler 2.0 shows ads.

### Which is updated more often, 定規(Ruler) or Ruler 2.0?

定規(Ruler) ships an update every 6 months, and Ruler 2.0 every 5 months. Most recently, 定規(Ruler) was updated on October 24, 2026 and Ruler 2.0 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.*