# Image Ruler vs CAPN

The clearest difference is rating: CAPN at 5.0 against Image Ruler's 1.5. CAPN also leads on in-app purchases (none vs 7) and update cadence (every 2 days vs every 3 weeks). Image Ruler's advantage is ratings volume (44 vs 3). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Image Ruler sells 5 one-off in-app purchases. CAPN asks for nothing beyond the download.

CAPN holds the better App Store score, 5.0 against 1.5. That said, the two scores are not equally well evidenced: Image Ruler has 44 ratings behind it against 3, so its average is the more settled of the two.

Image Ruler ships an update every 3 weeks, CAPN every 2 days. The most recent releases landed on October 4, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Image Ruler | CAPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (44 ratings)](https://appshunter.io/ios/app/image-ruler-measures/id1474481911/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/capn/id1621796716/reviews)** |
| Number of ratings | **44** | 3 |
| Positive reviews | 17.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | Free |
| Size | 47 MB | 47 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Martin Schurmann](https://appshunter.io/developer/1469819101) | [CAPN LLC](https://appshunter.io/developer/1615348460) |

## What reviewers say

### 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

**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 |


### CAPN

[App page](https://appshunter.io/ios/app/capn/id1621796716)

This app connects users with trained community members for assistance in unsafe situations. It provides a network of trusted individuals ready to help when you feel vulnerable.

**Highlights:** Community-assisted protection, Trained and trusted members, Local assistance, Safety network, Compassionate support

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

**In-app purchases:** none


## Frequently asked questions

### Is Image Ruler free?

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

### Is CAPN free?

CAPN is free to download, with no in-app purchases.

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

CAPN is rated higher. Image Ruler averages 1.5 out of 5 from 44 ratings, while CAPN averages 5.0 from 3 ratings.

### Do Image Ruler or CAPN have ads?

Neither Image Ruler nor CAPN shows ads.

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

Image Ruler ships an update every 3 weeks, and CAPN every 2 days. Most recently, Image Ruler was updated on October 4, 2026 and CAPN on October 15, 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.*