# Air Ruler vs Read Big

The clearest difference is price: Read Big at Free against Air Ruler's $0.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Read Big is free to download; Air Ruler costs $0.99 up front. Air Ruler sells 3 in-app purchases, starting at $2.99 per month and Read Big sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Air Ruler | Read Big |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 7 MB | 2 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [HIROKI TOMIMURA](https://appshunter.io/developer/1891060238) |

## 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 |


### Read Big

[App page](https://appshunter.io/ios/app/read-big-ocr/id6771462731)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is Air Ruler free?

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

### Is Read Big free?

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

### Do Air Ruler or Read Big have ads?

Neither Air Ruler nor Read Big 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.*