# 【換気見える化】Logtta CO2モニター vs エアミル2B

The clearest difference is update cadence: 【換気見える化】Logtta CO2モニター at fortnightly against エアミル2B's every 6 months. 【換気見える化】Logtta CO2モニター also leads on iOS requirement (9.0 vs 15.0). 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.

【換気見える化】Logtta CO2モニター ships an update fortnightly, エアミル2B every 6 months. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 【換気見える化】Logtta CO2モニター | エアミル2B |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 months |
| Size | 56 MB | 22 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Step One Limited](https://appshunter.io/developer/646296997) | [RATOC Systems, Inc.](https://appshunter.io/developer/568725272) |

## What reviewers say

### 【換気見える化】Logtta CO2モニター

[App page](https://appshunter.io/ios/app/logtta-co2/id1515857917)

**Features:** macOS Compatibility

**In-app purchases:** none


### エアミル2B

[App page](https://appshunter.io/ios/app/2b/id1584092359)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 【換気見える化】Logtta CO2モニター free?

【換気見える化】Logtta CO2モニター is free to download, with no in-app purchases.

### Is エアミル2B free?

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

### Do 【換気見える化】Logtta CO2モニター or エアミル2B have ads?

Neither 【換気見える化】Logtta CO2モニター nor エアミル2B shows ads.

### Which is updated more often, 【換気見える化】Logtta CO2モニター or エアミル2B?

【換気見える化】Logtta CO2モニター ships an update fortnightly, and エアミル2B every 6 months. Most recently, 【換気見える化】Logtta CO2モニター was updated on October 10, 2026 and エアミル2B on October 6, 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.*