# Ruler vs Image Ruler

The clearest difference is review sentiment: Ruler at 63% against Image Ruler's 18%. Ruler also leads on rating (3.7 vs 1.6). Image Ruler's advantage is update cadence (every 3 weeks vs every 5 months) and monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Ruler sells 1 one-off in-app purchase and Image Ruler sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Ruler holds the better App Store score, 3.7 against 1.6. That said, the two scores are not equally well evidenced: Image Ruler has 45 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 63% of Ruler's written reviews are positive against 18% of Image Ruler's.

Ruler ships an update every 5 months, Image Ruler every 3 weeks. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Ruler | Image Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/ruler-scale-ruler/id919130707/reviews)** | [1.6 (45 ratings)](https://appshunter.io/ios/app/image-ruler-measures/id1474481911/reviews) |
| Number of ratings | 3 | **45** |
| Positive reviews | **63.0% of reviews** | 17.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 47 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Martin Schurmann](https://appshunter.io/developer/1469819101) |

## What reviewers say

### Ruler

[App page](https://appshunter.io/ios/app/ruler-scale-ruler/id919130707)

This app displays various measurement scales for length, including meters and inches. It allows users to set magnification ratios and reduced scales for different applications. Users can calibrate the ruler and adjust PPI settings for accurate measurements.

**Highlights:** Display various measurement scales, Set magnification ratios, Set reduced scales, Measure in meters and inches, Free mode for custom scales, Calibration for accuracy, PPI setting

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide Ads | $0.99 | one-time |


### Image Ruler

[App page](https://appshunter.io/ios/app/image-ruler-measures/id1474481911)

This app allows you to measure objects directly on photos. Simply take a picture, mark a known object for reference, and then draw measurements on other items within the same image. It supports both metric and imperial units and offers intuitive editing tools.

**Highlights:** Measure objects on photos, Use a known object as a reference, Supports metric and imperial units, Intuitive editing interface, Organize photos easily, Zoom for precision

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| imageRulerPro | $0.99 | one-time |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Big Tip | $4.99 | one-time |
| Big tip | $4.99 | one-time |


## Frequently asked questions

### Is Ruler free?

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

### Is Image Ruler free?

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

### Which has better reviews, Ruler or Image Ruler?

Ruler is rated higher. Ruler averages 3.7 out of 5 from 3 ratings, while Image Ruler averages 1.6 from 45 ratings.

### Do Ruler or Image Ruler have ads?

Both Ruler and Image Ruler show ads.

### Which is updated more often, Ruler or Image Ruler?

Ruler ships an update every 5 months, and Image Ruler every 3 weeks. Most recently, Ruler was updated on October 21, 2026 and Image 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.*