# HygieneKey vs Air2o

The clearest difference is iOS requirement: HygieneKey at 8.0 against Air2o's 15.1. 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 | HygieneKey | Air2o |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 59 MB | 17 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [春华 赖](https://appshunter.io/developer/1604536904) | [Sustainable Green Air for Airconditioning & Cooling](https://appshunter.io/developer/1749035527) |

## What reviewers say

### HygieneKey

[App page](https://appshunter.io/ios/app/hygienekey/id1178896230)

Control smart devices integrated with a special chip through your mobile. Easily program machines, manage schedules, monitor battery, and set refill life. Save and import device settings as profiles for quick setup.

**Highlights:** Profile setting and import, Battery status indication, Refill life setting and status, Working schedule setting, Normal/Peak time options, Device reset and service span setting, Password support

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

**In-app purchases:** none


### Air2o

[App page](https://appshunter.io/ios/app/air2o/id6503348049)

**In-app purchases:** none


## Frequently asked questions

### Is HygieneKey free?

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

### Is Air2o free?

Air2o is free to download, with no in-app purchases.

### Do HygieneKey or Air2o have ads?

Neither HygieneKey nor Air2o 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.*