# Air Ruler vs sound

The clearest difference is price: sound at Free against Air Ruler's $0.99. sound also leads on in-app purchases (none vs 3). Air Ruler's advantage is iOS requirement (17.6 vs 26.2). On ads and device support there is nothing between them.

sound is free to download; Air Ruler costs $0.99 up front. Air Ruler sells 3 in-app purchases, starting at $2.99 per month. sound asks for nothing beyond the download.

## The numbers

| Metric | Air Ruler | sound |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 4 months |
| Monetization | — | Free |
| Size | 7 MB | 135 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [祖浪 吴](https://appshunter.io/developer/1883572387) |

## What reviewers say

### Air Ruler

[App page](https://appshunter.io/ios/app/air-ruler-objects-measure/id6763083628)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler Premium - 30days | $2.99 | per month |
| Ruler premium - yearly | $8.99 | per year |
| Ruler Premium - lifetime | $29.99 | one-time |


### sound

[App page](https://appshunter.io/ios/app/sound-time/id6776622151)

This app helps you focus and learn with a Pomodoro timer and white noise generator. Track your progress with detailed statistics and enjoy a seamless experience with dark mode and dynamic island support.

**Highlights:** Pomodoro focus mode, Customizable timer and sound alerts, White noise sound library, Focus time statistics, Home screen widgets, Dark mode and Dynamic Island support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Air Ruler free?

Air Ruler costs $0.99, and also offers in-app purchases.

### Is sound free?

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

### Do Air Ruler or sound have ads?

Neither Air Ruler nor sound 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.*