# 100cm Ruler vs Ruler

The clearest difference is rating: Ruler at 5.0 against 100cm Ruler's 4.0. Ruler also leads on update cadence (every 2 days vs every 3 months) and ratings volume (5 vs 1). 100cm Ruler's advantage is monetization model (free with in-app purchases vs subscription) and iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 100cm Ruler sells 1 one-off in-app purchase and Ruler sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Ruler holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Ruler has 5 ratings behind it against 1, so its average is the more settled of the two.

100cm Ruler ships an update every 3 months, Ruler every 2 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 100cm Ruler | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/100cm-ruler/id982815744/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314/reviews)** |
| Number of ratings | 1 | **5** |
| Positive reviews | 45.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 62 MB | 27 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ZOOMO Inc.](https://appshunter.io/developer/490112424) | [Myroslav Drozd](https://appshunter.io/developer/1847677489) |

## 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 |


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314)

Transform your phone into a precise measuring tool. Accurately measure objects, surfaces, and distances using your screen or camera. Ideal for home, work, or on-the-go tasks, providing quick and reliable measurements.

**Highlights:** Measure objects on screen, Switch between units (cm, mm, inches), Save and share measurements, Easy-to-use interface, Accurate and fast measurements

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Ruler | $2.99 | per 7 days |
| Smart Ruler | $4.99 | per 7 days |
| Smart Ruler | $6.99 | per 7 days |
| Smart Ruler | $9.99 | per year |
| Smart Ruler | $14.99 | per year |
| Smart Ruler | $19.99 | per year |
| Smart Ruler | $24.99 | per year |


## Frequently asked questions

### Is 100cm Ruler free?

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

### Is Ruler free?

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

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

Ruler is rated higher. 100cm Ruler averages 4.0 out of 5 from 1 ratings, while Ruler averages 5.0 from 5 ratings.

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

Neither 100cm Ruler nor Ruler shows ads.

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

100cm Ruler ships an update every 3 months, and Ruler every 2 days. Most recently, 100cm Ruler was updated on November 1, 2026 and Ruler on October 30, 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.*