# ArcAir vs Windmill Air

The clearest difference is review sentiment: ArcAir at 100% against Windmill Air's 28%. ArcAir also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). Windmill Air's advantage is rating (4.7 vs 4.0) and in-app purchases (none vs 2). On price and ads there is nothing between them.

Both are free to download. ArcAir sells 2 one-off in-app purchases. Windmill Air asks for nothing beyond the download.

Windmill Air holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Windmill Air has 6.2K ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 100% of ArcAir's written reviews are positive against 28% of Windmill Air's, so the app with the better star average is not the one people write more warmly about.

ArcAir ships an update every 5 months, Windmill Air every 2 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | ArcAir | Windmill Air |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (8 ratings)](https://appshunter.io/ios/app/arcair/id1133492319/reviews) | **[4.7 (6.2K ratings)](https://appshunter.io/ios/app/windmill-air/id1589463108/reviews)** |
| Number of ratings | 8 | **6.2K** |
| Positive reviews | **100.0% of reviews** | 27.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 21 MB | 83 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hamilton AG](https://appshunter.io/developer/530886485) | [The Air Lab, Inc.](https://appshunter.io/developer/1521133311) |

## What reviewers say

### ArcAir

[App page](https://appshunter.io/ios/app/arcair/id1133492319)

This app facilitates the online monitoring and visualization of various sensor data for biotechnological processes. It allows wireless communication with multiple sensors simultaneously and provides central data management, reporting, and validation for sensor calibration and configuration, supporting GMP guidelines.

**Highlights:** Online sensor monitoring, Data visualization, Wireless sensor communication, Central data management, Sensor calibration validation, Paperless workflow support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ArcAir Basic Version | Free | one-time |
| ArcAir Advanced Version | $199.99 | one-time |


### Windmill Air

[App page](https://appshunter.io/ios/app/windmill-air/id1589463108)

This app allows you to remotely control your smart air care devices. Set schedules and adjust settings to create your ideal home climate from anywhere.

**Highlights:** Remote product control, Set automation schedules, Adjust any setting, Create ideal home climate, Eco-friendly product integration

**In-app purchases:** none

**What reviewers like**

- 🚀 Aesthetically pleasing design
- 🚀 Quiet operation
- 🚀 Easy installation
- 👍 Responsive app
- 👍 Useful remote control features

**What reviewers complain about**

- 🐛 Inaccurate temperature readings
- 🐛 Unreliable app connectivity and functionality
- 🐛 Automation issues and failures
- 🐛 Inconsistent settings and mode changes
- 🐛 Glitchy app with frequent bugs

**Reported bugs**

- App unable to maintain accurate room temperature readings
- Automations not working as expected or reverting settings
- Connectivity issues causing the app to lose control of the unit
- Inconsistent behavior when turning the unit on/off or changing settings

**Requested features**

- Integration with smart home platforms
- Improved automation and scheduling capabilities
- More granular temperature and fan speed controls
- Ability to disable annoying app notifications


## Frequently asked questions

### Is ArcAir free?

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

### Is Windmill Air free?

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

### Which has better reviews, ArcAir or Windmill Air?

Windmill Air is rated higher. ArcAir averages 4.0 out of 5 from 8 ratings, while Windmill Air averages 4.7 from 6.2K ratings.

### Do ArcAir or Windmill Air have ads?

Neither ArcAir nor Windmill Air shows ads.

### Which is updated more often, ArcAir or Windmill Air?

ArcAir ships an update every 5 months, and Windmill Air every 2 months. Most recently, ArcAir was updated on October 24, 2026 and Windmill Air on October 22, 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.*