# Ruler vs SquareDox

The clearest difference is in-app purchases: SquareDox at none against Ruler's 1. SquareDox also leads on ads (none vs shown) and iOS requirement (12.4 vs 15.0). Ruler's advantage is update cadence (every 5 months vs every 27 months). On price and device support there is nothing between them.

Both are free to download. Ruler sells 1 one-off in-app purchase. SquareDox asks for nothing beyond the download.

Ruler ships an update every 5 months, SquareDox every 27 months. The most recent releases landed on October 13, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Ruler | SquareDox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/ruler-scale-ruler/id919130707/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 63.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 27 months |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 68 MB |
| Requires iOS | 15.0 | **12.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Zen exim Pvt Ltd](https://appshunter.io/developer/995150047) |

## 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 |


### SquareDox

[App page](https://appshunter.io/ios/app/squaredox/id1614051261)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ruler free?

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

### Is SquareDox free?

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

### Do Ruler or SquareDox have ads?

Ruler shows ads; SquareDox does not.

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

Ruler ships an update every 5 months, and SquareDox every 27 months. Most recently, Ruler was updated on October 13, 2026 and SquareDox on September 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.*