# Ruler ++ vs 100cm Ruler

The clearest difference is rating: 100cm Ruler at 4.0 against Ruler ++'s 3.5. 100cm Ruler also leads on review sentiment (45% vs 15%). Ruler ++'s advantage is ratings volume (934 vs 1) and iOS requirement (8.0 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Ruler ++ sells 1 one-off in-app purchase and 100cm Ruler sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

100cm Ruler holds the better App Store score, 4.0 against 3.5. That said, the two scores are not equally well evidenced: Ruler ++ has 934 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 15% of Ruler ++'s written reviews are positive against 45% of 100cm Ruler's.

Ruler ++ ships an update every 5 months, 100cm Ruler every 3 months. The most recent releases landed on September 26, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Ruler ++ | 100cm Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (934 ratings)](https://appshunter.io/ios/app/ruler-plus-plus/id381682088/reviews) | **[4.0 (1 ratings)](https://appshunter.io/ios/app/100cm-ruler/id982815744/reviews)** |
| Number of ratings | **934** | 1 |
| Positive reviews | 14.9% of reviews | **45.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 62 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fapps World et Cie S.E.C.S.](https://appshunter.io/developer/881437066) | [ZOOMO, Inc.](https://appshunter.io/developer/490112424) |

## What reviewers say

### Ruler ++

[App page](https://appshunter.io/ios/app/ruler-plus-plus/id381682088)

This app allows you to measure lengths accurately in both inches and centimeters. It provides a simple and straightforward tool for quick measurements.

**Highlights:** Measure in inches, Measure in centimeters, Accurate length measurement, Simple interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advertisement-free upgrade | $0.99 | one-time |

**What reviewers like**

- 👍 Simple and quick to use
- 👍 Includes both metric and Imperial measures
- 🚀 Great for wanting to measure displayed length

**What reviewers complain about**

- 🐛 Measurements are not accurate
- 🐛 Ruler not matching real-world measurements
- 🐛 Ruler not scaling properly on different devices
- 🔋 Ads make it impossible to use
- 🔋 Constant, intrusive ads

**Reported bugs**

- Ruler markings are incorrect
- Ruler not displaying full length on screen
- Incompatible with newer iPhone models

**Requested features**

- Add ability to calibrate ruler for different devices
- Improve accuracy of measurements
- Reduce or remove ads


### 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 |


## Frequently asked questions

### Is Ruler ++ free?

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

### Is 100cm Ruler free?

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

### Which has better reviews, Ruler ++ or 100cm Ruler?

100cm Ruler is rated higher. Ruler ++ averages 3.5 out of 5 from 934 ratings, while 100cm Ruler averages 4.0 from 1 ratings.

### Do Ruler ++ or 100cm Ruler have ads?

Neither Ruler ++ nor 100cm Ruler shows ads.

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

Ruler ++ ships an update every 5 months, and 100cm Ruler every 3 months. Most recently, Ruler ++ was updated on September 26, 2026 and 100cm Ruler on June 11, 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.*