# DuctChecker vs SetsubiWorks HVAC Sizing Calc

The clearest difference is price: SetsubiWorks HVAC Sizing Calc at Free against DuctChecker's $6.99. SetsubiWorks HVAC Sizing Calc also leads on update cadence (weekly vs every 4 months). DuctChecker's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

SetsubiWorks HVAC Sizing Calc is free to download; DuctChecker costs $6.99 up front. SetsubiWorks HVAC Sizing Calc sells 2 one-off in-app purchases. DuctChecker asks for nothing beyond the download.

DuctChecker ships an update every 4 months, SetsubiWorks HVAC Sizing Calc weekly. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | DuctChecker | SetsubiWorks HVAC Sizing Calc |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Paid | — |
| Size | 23 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) | [MASAYOSHI SUGIMOTO](https://appshunter.io/developer/6808413630) |

## 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


### SetsubiWorks HVAC Sizing Calc

[App page](https://appshunter.io/ios/app/setsubiworks-hvac-sizing-calc/id6808413628)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| 設備Works 製品版 | $4.99 | one-time |


## Frequently asked questions

### Is DuctChecker free?

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

### Is SetsubiWorks HVAC Sizing Calc free?

SetsubiWorks HVAC Sizing Calc is free to download, with in-app purchases available.

### Do DuctChecker or SetsubiWorks HVAC Sizing Calc have ads?

Neither DuctChecker nor SetsubiWorks HVAC Sizing Calc shows ads.

### Which is updated more often, DuctChecker or SetsubiWorks HVAC Sizing Calc?

DuctChecker ships an update every 4 months, and SetsubiWorks HVAC Sizing Calc weekly. Most recently, DuctChecker was updated on October 29, 2026 and SetsubiWorks HVAC Sizing Calc on October 26, 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.*