# Omni CFM Calculator vs Duct Sizer Calc HVAC

The clearest difference is price: Omni CFM Calculator at Free against Duct Sizer Calc HVAC's $0.99. Omni CFM Calculator also leads on in-app purchases (none vs 1). Duct Sizer Calc HVAC's advantage is chart position (#184 vs unranked). On ads, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | Omni CFM Calculator | Duct Sizer Calc HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Best chart rank | — | **#184** |
| Size | 34 MB | 34 MB |
| Requires iOS | 14.0.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Omni CleanAir](https://appshunter.io/developer/1809427308) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### Omni CFM Calculator

[App page](https://appshunter.io/ios/app/omni-cfm-calculator/id6744829758)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duct Sizer Calc HVAC

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

**Currently charting:** #184 Top Paid · Utilities (US App Store)

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Omni CFM Calculator free?

Omni CFM Calculator is free to download, with no in-app purchases.

### Is Duct Sizer Calc HVAC free?

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

### Do Omni CFM Calculator or Duct Sizer Calc HVAC have ads?

Neither Omni CFM Calculator nor Duct Sizer Calc HVAC 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.*