# HygieneKey vs Wireless Scent

HygieneKey and Wireless Scent are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

HygieneKey ships an update every 2 months, Wireless Scent monthly. The most recent releases landed on September 23, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | HygieneKey | Wireless Scent |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 59 MB | 23 MB |
| Requires iOS | **8.0** | 9.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [春华 赖](https://appshunter.io/developer/1604536904) | [先妥 冯](https://appshunter.io/developer/1592043796) |

## 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


### Wireless Scent

[App page](https://appshunter.io/ios/app/wireless-scent/id1592500598)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HygieneKey free?

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

### Is Wireless Scent free?

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

### Do HygieneKey or Wireless Scent have ads?

Neither HygieneKey nor Wireless Scent shows ads.

### Which is updated more often, HygieneKey or Wireless Scent?

HygieneKey ships an update every 2 months, and Wireless Scent monthly. Most recently, HygieneKey was updated on September 23, 2026 and Wireless Scent on September 27, 2026.

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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.*