# DuctSizer Pro vs Static Pressure & Duct Check

The clearest difference is in-app purchases: Static Pressure & Duct Check at none against DuctSizer Pro's 1. DuctSizer Pro's advantage is update cadence (weekly vs fortnightly) and ratings volume (3 vs 1). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. DuctSizer Pro sells 1 one-off in-app purchase. Static Pressure & Duct Check asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for DuctSizer Pro against 5.0 for Static Pressure & Duct Check. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

DuctSizer Pro ships an update weekly, Static Pressure & Duct Check fortnightly. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | DuctSizer Pro | Static Pressure & Duct Check |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/ductsizer-pro/id6772545249/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/static-pressure-and-duct-check/id6786886923/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Free | Free |
| Size | 5 MB | 33 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [LEONARDO NOVOA](https://appshunter.io/developer/6772526007) | [Mike Watson](https://appshunter.io/developer/1848411021) |

## What reviewers say

### DuctSizer Pro

[App page](https://appshunter.io/ios/app/ductsizer-pro/id6772545249)

This tool quickly calculates HVAC duct sizes based on airflow and friction loss. It supports various duct shapes and provides key airflow values for field use.

**Highlights:** Calculate CFM from duct size, Find duct sizes from CFM, Supports square, round, and oval duct, Shows velocity, friction, area, and equivalent round size, Highlights suggested duct sizes, Compares alternate duct sizes

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### Static Pressure & Duct Check

[App page](https://appshunter.io/ios/app/static-pressure-and-duct-check/id6786886923)

This utility app provides HVAC professionals with tools for duct sizing and field checks based on ACCA Manual D methods. It offers quick calculations for duct size, friction rate, velocity, and static pressure, all while prioritizing user privacy and offline functionality.

**Highlights:** Quick duct sizing (round/rectangular), Duct friction rate and velocity checks, Static pressure calculations, Offline functionality, No account or tracking required, Plausibility checks for inputs

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

**In-app purchases:** none


## Frequently asked questions

### Is DuctSizer Pro free?

DuctSizer Pro is free to download, with in-app purchases available.

### Is Static Pressure & Duct Check free?

Static Pressure & Duct Check is free to download, with no in-app purchases.

### Which has better reviews, DuctSizer Pro or Static Pressure & Duct Check?

DuctSizer Pro and Static Pressure & Duct Check are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do DuctSizer Pro or Static Pressure & Duct Check have ads?

Neither DuctSizer Pro nor Static Pressure & Duct Check shows ads.

### Which is updated more often, DuctSizer Pro or Static Pressure & Duct Check?

DuctSizer Pro ships an update weekly, and Static Pressure & Duct Check fortnightly. Most recently, DuctSizer Pro was updated on October 24, 2026 and Static Pressure & Duct Check on October 6, 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.*