# Millimeter Pro vs Ruler

The clearest difference is price: Ruler at Free against Millimeter Pro's $3.99. Ruler also leads on iOS requirement (11.0 vs 15.0). Millimeter Pro's advantage is in-app purchases (none vs 2) and ads (none vs shown). On rating, ratings volume, update cadence and device support there is nothing between them.

Ruler is free to download; Millimeter Pro costs $3.99 up front. Ruler sells 2 in-app purchases, starting at $1.99 per 7 days. Millimeter Pro asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.4 for Millimeter Pro against 4.3 for Ruler. Both are backed by a comparable volume of ratings — 109 and 136 respectively. Written reviews are what separate them: 58% of Millimeter Pro's written reviews are positive against 33% of Ruler's.

Millimeter Pro ships an update every 4 months, Ruler every 7 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Millimeter Pro | Ruler |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.4 (109 ratings)](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777/reviews)** | [4.3 (136 ratings)](https://appshunter.io/ios/app/ruler-measuring-scale/id1449113794/reviews) |
| Number of ratings | 109 | **136** |
| Positive reviews | **57.9% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#186** | — |
| Size | 24 MB | 32 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [MD KHAIRUL ISLAM](https://appshunter.io/developer/1445424899) |

## What reviewers say

### Millimeter Pro

[App page](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777)

**Currently charting:** #186 Top Paid · Utilities (US App Store)

This app transforms your device into a versatile measuring tool. It allows for precise measurements of length, area, diameter, and angles using the touchscreen. Easily split objects into equal parts and switch between millimeters and inches for your convenience.

**Highlights:** Touchscreen ruler and tape measure, Measure length, area, diameter, and angles, Split objects into equal parts, Supports millimeters and inches, Estimate radius, Thread pitch gauge

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

**In-app purchases:** none


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-scale/id1449113794)

This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.

**Highlights:** Augmented reality measurement, Measure length and area, High precision with AR Kit, Unlimited measurements (premium), Ad-free experience (premium), Subscription options available

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler Premium Weekly | $1.99 | per 7 days |
| Ruler Monthly Premium | $5.99 | per month |


## Frequently asked questions

### Is Millimeter Pro free?

Millimeter Pro costs $3.99, with no in-app purchases.

### Is Ruler free?

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

### Which has better reviews, Millimeter Pro or Ruler?

Millimeter Pro is rated higher. Millimeter Pro averages 4.4 out of 5 from 109 ratings, while Ruler averages 4.3 from 136 ratings.

### Do Millimeter Pro or Ruler have ads?

Ruler shows ads; Millimeter Pro does not.

### Which is updated more often, Millimeter Pro or Ruler?

Millimeter Pro ships an update every 4 months, and Ruler every 7 months. Most recently, Millimeter Pro was updated on October 24, 2026 and Ruler on October 24, 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.*