# Air Flow Conversion Calculator vs Hansen Ventilation

The clearest difference is price: Hansen Ventilation at Free against Air Flow Conversion Calculator's $2.99. Hansen Ventilation also leads on update cadence (every 11 months vs every 47 months). Air Flow Conversion Calculator's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Hansen Ventilation is free to download; Air Flow Conversion Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Air Flow Conversion Calculator ships an update every 47 months, Hansen Ventilation every 11 months. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Air Flow Conversion Calculator | Hansen Ventilation |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.5 (11 ratings)](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 47 months | **Every 11 months** |
| Monetization | Paid | — |
| Size | 8 MB | 14 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [EP spa](https://appshunter.io/developer/1688557966) |

## What reviewers say

### Air Flow Conversion Calculator

[App page](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553)

Easily calculate air velocity and airflow volume for various duct types. Input dimensions and units, and get instant results for HVAC and ventilation applications.

**Highlights:** Calculate air velocity and airflow volume, Support for circular and rectangular ducts, Multiple unit options for velocity, volume, and dimensions, Instant result display, Useful for HVAC and ventilation

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

**In-app purchases:** none


### Hansen Ventilation

[App page](https://appshunter.io/ios/app/hansen-ventilation/id6503288430)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Air Flow Conversion Calculator free?

Air Flow Conversion Calculator costs $2.99, with no in-app purchases.

### Is Hansen Ventilation free?

Hansen Ventilation is free to download, with no in-app purchases.

### Do Air Flow Conversion Calculator or Hansen Ventilation have ads?

Neither Air Flow Conversion Calculator nor Hansen Ventilation shows ads.

### Which is updated more often, Air Flow Conversion Calculator or Hansen Ventilation?

Air Flow Conversion Calculator ships an update every 47 months, and Hansen Ventilation every 11 months. Most recently, Air Flow Conversion Calculator was updated on October 22, 2026 and Hansen Ventilation on October 16, 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.*