# エアミル2W vs Chime Machine

The clearest difference is in-app purchases: エアミル2W at none against Chime Machine's 2. エアミル2W also leads on iOS requirement (15.0 vs 18.0). Chime Machine's advantage is update cadence (every 10 days vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Chime Machine sells 2 in-app purchases, starting at $2.99 per month. エアミル2W asks for nothing beyond the download.

エアミル2W ships an update every 5 weeks, Chime Machine every 10 days. The most recent releases landed on July 28, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | エアミル2W | Chime Machine |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | Free | — |
| Size | 20 MB | 91 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RATOC Systems, Inc.](https://appshunter.io/developer/568725272) | [moonxseed](https://appshunter.io/developer/310554167) |

## What reviewers say

### エアミル2W

[App page](https://appshunter.io/ios/app/2w/id1566331258)

Monitor environmental conditions with real-time data and historical graphs. This app visualizes temperature, humidity, and CO2 levels from a compatible Wi-Fi sensor.

**Highlights:** Real-time data display, Historical graph visualization, Temperature monitoring, Humidity monitoring, CO2 concentration tracking

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

**In-app purchases:** none


### Chime Machine

[App page](https://appshunter.io/ios/app/chime-machine/id6748895957)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro subscription | $2.99 | per month |
| Yearly Pro subscription | $29.99 | per year |


## Frequently asked questions

### Is エアミル2W free?

エアミル2W is free to download, with no in-app purchases.

### Is Chime Machine free?

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

### Do エアミル2W or Chime Machine have ads?

Neither エアミル2W nor Chime Machine shows ads.

### Which is updated more often, エアミル2W or Chime Machine?

エアミル2W ships an update every 5 weeks, and Chime Machine every 10 days. Most recently, エアミル2W was updated on July 28, 2026 and Chime Machine on September 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.*