# DuctChecker vs 空気状態の計算

The clearest difference is price: 空気状態の計算 at Free against DuctChecker's $6.99. DuctChecker's advantage is in-app purchases (none vs 2) and device support.

空気状態の計算 is free to download; DuctChecker costs $6.99 up front. 空気状態の計算 sells 2 in-app purchases, starting at $0.49 per month. DuctChecker asks for nothing beyond the download.

## The numbers

| Metric | DuctChecker | 空気状態の計算 |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | — |
| Update frequency | Every 4 months | — |
| Monetization | Paid | — |
| Size | 23 MB | 1 MB |
| Requires iOS | **15.0** | 17.4 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 17+ |
| Developer | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) | [Sho Akita](https://appshunter.io/developer/1743635853) |

## What reviewers say

### DuctChecker

[App page](https://appshunter.io/ios/app/ductchecker/id933593987)

Easily calculate duct dimensions using various engineering methods like constant pressure, static pressure regain, total pressure, and velocity. This tool simplifies complex duct design calculations, typically found in flow diagrams or slide rules.

**Highlights:** Constant pressure method calculation, Static pressure regain method, Total pressure method, Velocity method, Duct dimension determination, Simplified duct design

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

**In-app purchases:** none


### 空気状態の計算

[App page](https://appshunter.io/ios/app/id6504130643)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1ヶ月利用 -アプリ内の計算ツールの利用権- | $0.49 | per month |
| 1年間利用 -アプリ内の計算ツールの利用権- | $4.99 | per year |


## Frequently asked questions

### Is DuctChecker free?

DuctChecker costs $6.99, with no in-app purchases.

### Is 空気状態の計算 free?

空気状態の計算 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.*