# Air Quality System (AQS) vs QualiT Check

The clearest difference is iOS requirement: Air Quality System (AQS) at 14.0 against QualiT Check's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Air Quality System (AQS) | QualiT Check |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 25 MB | 62 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Prisma Electronics SA](https://appshunter.io/developer/418621487) | [Carly Solutions GmbH Co KG](https://appshunter.io/developer/408379680) |

## What reviewers say

### Air Quality System (AQS)

[App page](https://appshunter.io/ios/app/air-quality-system-aqs/id6447432945)

**Features:** macOS Compatibility

**In-app purchases:** none


### QualiT Check

[App page](https://appshunter.io/ios/app/qualit-check/id6754276556)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Air Quality System (AQS) free?

Air Quality System (AQS) is free to download, with no in-app purchases.

### Is QualiT Check free?

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

### Do Air Quality System (AQS) or QualiT Check have ads?

Neither Air Quality System (AQS) nor QualiT Check 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.*