# 100cm Ruler vs AirRuler AR

The clearest difference is in-app purchases: AirRuler AR at none against 100cm Ruler's 1. AirRuler AR also leads on rating (4.4 vs 4.0) and ratings volume (95 vs 1). 100cm Ruler's advantage is update cadence (every 3 months vs every 32 months) and review sentiment (45% vs 20%). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 100cm Ruler sells 1 one-off in-app purchase. AirRuler AR asks for nothing beyond the download.

AirRuler AR holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: AirRuler AR has 95 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 45% of 100cm Ruler's written reviews are positive against 20% of AirRuler AR's, so the app with the better star average is not the one people write more warmly about.

100cm Ruler ships an update every 3 months, AirRuler AR every 32 months. The most recent releases landed on October 14, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 100cm Ruler | AirRuler AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/100cm-ruler/id982815744/reviews) | **[4.4 (95 ratings)](https://appshunter.io/ios/app/airruler-ar-no-ads/id1384083768/reviews)** |
| Number of ratings | 1 | **95** |
| Positive reviews | **45.1% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 32 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 62 MB | 9 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZOOMO Inc.](https://appshunter.io/developer/490112424) | [Appulet, Inc](https://appshunter.io/developer/1164224103) |

## What reviewers say

### 100cm Ruler

[App page](https://appshunter.io/ios/app/100cm-ruler/id982815744)

This app provides a digital ruler for measuring the length and diameter of small objects directly on your device. It features a millimeter scale and allows for easy sliding to measure.

**Highlights:** Digital ruler functionality, Millimeter scale, Diameter measurement, Screen sliding for measurement, Ad removal option

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### AirRuler AR

[App page](https://appshunter.io/ios/app/airruler-ar-no-ads/id1384083768)

Measure distances and lengths using your device's camera. Simply tap the screen and move your phone to get accurate measurements on flat surfaces with good lighting. This tool is designed for quick and easy spatial calculations.

**Highlights:** AR measurement, Tap-to-measure functionality, Distance calculation, Works on flat surfaces, Requires ARKit

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

**In-app purchases:** none


## Frequently asked questions

### Is 100cm Ruler free?

100cm Ruler is free to download, with in-app purchases available.

### Is AirRuler AR free?

AirRuler AR is free to download, with no in-app purchases.

### Which has better reviews, 100cm Ruler or AirRuler AR?

AirRuler AR is rated higher. 100cm Ruler averages 4.0 out of 5 from 1 ratings, while AirRuler AR averages 4.4 from 95 ratings.

### Do 100cm Ruler or AirRuler AR have ads?

Neither 100cm Ruler nor AirRuler AR shows ads.

### Which is updated more often, 100cm Ruler or AirRuler AR?

100cm Ruler ships an update every 3 months, and AirRuler AR every 32 months. Most recently, 100cm Ruler was updated on October 14, 2026 and AirRuler AR on October 29, 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.*