# 【CO2センサー】換気エアミエル vs Habit Calendar

The clearest difference is in-app purchases: 【CO2センサー】換気エアミエル at none against Habit Calendar's 3. 【CO2センサー】換気エアミエル also leads on iOS requirement (12.1 vs 16.4). Habit Calendar's advantage is device support. On price there is nothing between them.

Both are free to download. Habit Calendar sells 3 in-app purchases, starting at $2.99 per month. 【CO2センサー】換気エアミエル asks for nothing beyond the download.

## The numbers

| Metric | 【CO2センサー】換気エアミエル | Habit Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 2 days |
| Size | 37 MB | 57 MB |
| Requires iOS | **12.1** | 16.4 |
| Devices | — | **iPhone, iPad** |
| Age rating | 12+ | 17+ |
| Developer | [Step One Limited](https://appshunter.io/developer/646296997) | [KAZUKI SAWASHIMA](https://appshunter.io/developer/6792463378) |

## What reviewers say

### 【CO2センサー】換気エアミエル

[App page](https://appshunter.io/ios/app/co2/id1549479731)

**In-app purchases:** none


### Habit Calendar

[App page](https://appshunter.io/ios/app/habit-calendar-dekitabi/id6809199621)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO 月額 | $2.99 | per month |
| PRO 年額 | $22.99 | per year |
| PRO 買い切り | $19.99 | one-time |


## Frequently asked questions

### Is 【CO2センサー】換気エアミエル free?

【CO2センサー】換気エアミエル is free to download, with no in-app purchases.

### Is Habit Calendar free?

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

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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.*