# Post Matrix Scan vs Screen Ruler

The clearest difference is in-app purchases: Post Matrix Scan at none against Screen Ruler's 3. Post Matrix Scan also leads on update cadence (weekly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Screen Ruler sells 3 in-app purchases, starting at $2.99 per 7 days. Post Matrix Scan asks for nothing beyond the download.

Post Matrix Scan ships an update weekly, Screen Ruler every 4 months. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Post Matrix Scan | Screen Ruler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 months |
| Size | 2 MB | 3 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Philipp Kursawe](https://appshunter.io/developer/1685585255) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## What reviewers say

### Post Matrix Scan

[App page](https://appshunter.io/ios/app/post-matrix-scan/id6758661802)

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

**In-app purchases:** none


### Screen Ruler

[App page](https://appshunter.io/ios/app/screen-ruler-actual-size/id6772123351)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fraction Inch Weekly | $2.99 | per 7 days |
| Card Calibration Yearly | $14.99 | per year |
| Ring & Screw Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Post Matrix Scan free?

Post Matrix Scan is free to download, with no in-app purchases.

### Is Screen Ruler free?

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

### Do Post Matrix Scan or Screen Ruler have ads?

Neither Post Matrix Scan nor Screen Ruler shows ads.

### Which is updated more often, Post Matrix Scan or Screen Ruler?

Post Matrix Scan ships an update weekly, and Screen Ruler every 4 months. Most recently, Post Matrix Scan was updated on November 9, 2026 and Screen Ruler on November 5, 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.*