# Ruler+ Utility vs 3Denkou

The clearest difference is in-app purchases: 3Denkou at none against Ruler+ Utility's 1. 3Denkou also leads on ads (none vs shown) and update cadence (every 4 days vs every 40 months). Ruler+ Utility's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Ruler+ Utility sells 1 one-off in-app purchase. 3Denkou asks for nothing beyond the download.

Ruler+ Utility ships an update every 40 months, 3Denkou every 4 days. The most recent releases landed on November 1, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Ruler+ Utility | 3Denkou |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/ruler-plus-utility/id1017729457/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 40 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 56 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kyungjin Lee](https://appshunter.io/developer/572393811) | [Kennedy Murakami](https://appshunter.io/developer/1578460606) |

## What reviewers say

### Ruler+ Utility

[App page](https://appshunter.io/ios/app/ruler-plus-utility/id1017729457)

Transform your smartphone into a versatile measuring tool. Instantly measure the length of objects using your phone's screen, with options for fixed or scroll modes. Save your measurements and choose between centimeters or inches for precise results.

**Highlights:** Smartphone ruler, Fixed and scroll measurement modes, Save measurements, Centimeter and inch support, Fine-tune scale, Intuitive interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### 3Denkou

[App page](https://appshunter.io/ios/app/3denkou/id6789784377)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ruler+ Utility free?

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

### Is 3Denkou free?

3Denkou is free to download, with no in-app purchases.

### Do Ruler+ Utility or 3Denkou have ads?

Ruler+ Utility shows ads; 3Denkou does not.

### Which is updated more often, Ruler+ Utility or 3Denkou?

Ruler+ Utility ships an update every 40 months, and 3Denkou every 4 days. Most recently, Ruler+ Utility was updated on November 1, 2026 and 3Denkou on November 12, 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.*