# Duct Sizer Calc HVAC vs ChekDuct

The clearest difference is price: ChekDuct at Free against Duct Sizer Calc HVAC's $0.99. ChekDuct also leads on in-app purchases (none vs 1). Duct Sizer Calc HVAC's advantage is iOS requirement (13.0 vs 15.1). On ads and device support there is nothing between them.

ChekDuct is free to download; Duct Sizer Calc HVAC costs $0.99 up front. Duct Sizer Calc HVAC sells 1 one-off in-app purchase. ChekDuct asks for nothing beyond the download.

## The numbers

| Metric | Duct Sizer Calc HVAC | ChekDuct |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Size | 34 MB | 187 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) | [Mohamed Kharbat](https://appshunter.io/developer/1894953065) |

## What reviewers say

### Duct Sizer Calc HVAC

[App page](https://appshunter.io/ios/app/duct-sizer-calc-hvac/id6764646921)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


### ChekDuct

[App page](https://appshunter.io/ios/app/chekduct/id6768763588)

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

**In-app purchases:** none


## Frequently asked questions

### Is Duct Sizer Calc HVAC free?

Duct Sizer Calc HVAC costs $0.99, and also offers in-app purchases.

### Is ChekDuct free?

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

### Do Duct Sizer Calc HVAC or ChekDuct have ads?

Neither Duct Sizer Calc HVAC nor ChekDuct shows ads.

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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.*