# DuctChecker vs AGA

The clearest difference is price: AGA at $0.99 against DuctChecker's $6.99. DuctChecker's advantage is update cadence (every 4 months vs every 15 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DuctChecker costs $6.99 and AGA $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DuctChecker ships an update every 4 months, AGA every 15 months. The most recent releases landed on October 29, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | DuctChecker | AGA |
| --- | --- | --- |
| Price | $6.99 | **$0.99** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 15 months |
| Monetization | Paid | — |
| Size | 23 MB | 1 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) | [Bjarne Berge](https://appshunter.io/developer/1209858941) |

## 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


### AGA

[App page](https://appshunter.io/ios/app/aga-3-orifice/id1350504597)

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

**In-app purchases:** none


## Frequently asked questions

### Is DuctChecker free?

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

### Is AGA free?

AGA costs $0.99, with no in-app purchases.

### Do DuctChecker or AGA have ads?

Neither DuctChecker nor AGA shows ads.

### Which is updated more often, DuctChecker or AGA?

DuctChecker ships an update every 4 months, and AGA every 15 months. Most recently, DuctChecker was updated on October 29, 2026 and AGA on October 14, 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.*