# Ring Ruler vs Smart Compass Pro

The clearest difference is price: Ring Ruler at Free against Smart Compass Pro's $2.99. Ring Ruler also leads on iOS requirement (13.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Ring Ruler is free to download; Smart Compass Pro costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Ring Ruler | Smart Compass Pro |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 21 MB | 21 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Sent](https://appshunter.io/developer/1696600749) | [nakhon phagdeechat](https://appshunter.io/developer/386312256) |

## What reviewers say

### Ring Ruler

[App page](https://appshunter.io/ios/app/ring-ruler/id6757495549)

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Compass Pro

[App page](https://appshunter.io/ios/app/smart-compass-pro/id6771642420)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ring Ruler free?

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

### Is Smart Compass Pro free?

Smart Compass Pro costs $2.99, with no in-app purchases.

### Do Ring Ruler or Smart Compass Pro have ads?

Neither Ring Ruler nor Smart Compass Pro shows ads.

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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.*