# DuctChecker vs 空気線図Pro 湿り空気線図・空調計算

The clearest difference is price: 空気線図Pro 湿り空気線図・空調計算 at Free against DuctChecker's $6.99. 空気線図Pro 湿り空気線図・空調計算 also leads on update cadence (every 3 days vs every 4 months). DuctChecker's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

空気線図Pro 湿り空気線図・空調計算 is free to download; DuctChecker costs $6.99 up front. 空気線図Pro 湿り空気線図・空調計算 sells 1 one-off in-app purchase. DuctChecker asks for nothing beyond the download.

DuctChecker ships an update every 4 months, 空気線図Pro 湿り空気線図・空調計算 every 3 days. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | DuctChecker | 空気線図Pro 湿り空気線図・空調計算 |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Paid | — |
| Size | 23 MB | 8 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) | [koichi hashimoto](https://appshunter.io/developer/1659408789) |

## 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


### 空気線図Pro 湿り空気線図・空調計算

[App page](https://appshunter.io/ios/app/pro/id6792616333)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $5.99 | one-time |


## Frequently asked questions

### Is DuctChecker free?

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

### Is 空気線図Pro 湿り空気線図・空調計算 free?

空気線図Pro 湿り空気線図・空調計算 is free to download, with in-app purchases available.

### Do DuctChecker or 空気線図Pro 湿り空気線図・空調計算 have ads?

空気線図Pro 湿り空気線図・空調計算 shows ads; DuctChecker does not.

### Which is updated more often, DuctChecker or 空気線図Pro 湿り空気線図・空調計算?

DuctChecker ships an update every 4 months, and 空気線図Pro 湿り空気線図・空調計算 every 3 days. Most recently, DuctChecker was updated on October 8, 2026 and 空気線図Pro 湿り空気線図・空調計算 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.*