# 100cm Ruler vs Screenshot Pixel Measure Tool

The clearest difference is update cadence: Screenshot Pixel Measure Tool at fortnightly against 100cm Ruler's every 3 months. Screenshot Pixel Measure Tool also leads on review sentiment (67% vs 45%) and rating (4.3 vs 4.0). 100cm Ruler's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. 100cm Ruler sells 1 one-off in-app purchase and Screenshot Pixel Measure Tool sells 6 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Screenshot Pixel Measure Tool holds the better App Store score, 4.3 against 4.0. That said, the two scores are not equally well evidenced: Screenshot Pixel Measure Tool has 25 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 45% of 100cm Ruler's written reviews are positive against 67% of Screenshot Pixel Measure Tool's.

100cm Ruler ships an update every 3 months, Screenshot Pixel Measure Tool fortnightly. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 100cm Ruler | Screenshot Pixel Measure Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/100cm-ruler/id982815744/reviews) | **[4.3 (25 ratings)](https://appshunter.io/ios/app/screenshot-pixel-measure-tool/id1104790987/reviews)** |
| Number of ratings | 1 | **25** |
| Positive reviews | 45.1% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 62 MB | 23 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZOOMO Inc.](https://appshunter.io/developer/490112424) | [InfoEnum Software Systems](https://appshunter.io/developer/832495044) |

## 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 |


### Screenshot Pixel Measure Tool

[App page](https://appshunter.io/ios/app/screenshot-pixel-measure-tool/id1104790987)

Precisely measure dimensions, angles, and areas on any image. Utilize AI-powered features for automatic scaling, edge detection, and object dimension analysis. Export your annotated measurements as PDF or PNG files.

**Highlights:** Pixel-perfect measurement tools, AI-powered auto-scaling and edge detection, Protractor for angle measurement, Area calculation, Color analysis and extraction, Export annotations as PDF/PNG, Apple Pencil support

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $9.99 | per year |
| Yearly Special | $29.99 | per year |
| Non Renewable subscription | $1.99 | one-time |
| Non Renewable subscription | $19.99 | one-time |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is 100cm Ruler free?

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

### Is Screenshot Pixel Measure Tool free?

Screenshot Pixel Measure Tool is free to download, with in-app purchases available.

### Which has better reviews, 100cm Ruler or Screenshot Pixel Measure Tool?

Screenshot Pixel Measure Tool is rated higher. 100cm Ruler averages 4.0 out of 5 from 1 ratings, while Screenshot Pixel Measure Tool averages 4.3 from 25 ratings.

### Do 100cm Ruler or Screenshot Pixel Measure Tool have ads?

Neither 100cm Ruler nor Screenshot Pixel Measure Tool shows ads.

### Which is updated more often, 100cm Ruler or Screenshot Pixel Measure Tool?

100cm Ruler ships an update every 3 months, and Screenshot Pixel Measure Tool fortnightly. Most recently, 100cm Ruler was updated on October 14, 2026 and Screenshot Pixel Measure Tool on October 4, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*