# HVAC Pipe Sizer Plus vs Duct Calculator

The clearest difference is rating: Duct Calculator at 4.5 against HVAC Pipe Sizer Plus's 3.0. Duct Calculator also leads on update cadence (every 2 months vs every 15 months) and ratings volume (189 vs 1). HVAC Pipe Sizer Plus's advantage is price ($13.99 vs $19.99) and review sentiment (67% vs 57%). On ads and in-app purchases there is nothing between them.

HVAC Pipe Sizer Plus costs $13.99 and Duct Calculator $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Duct Calculator holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Duct Calculator has 189 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 67% of HVAC Pipe Sizer Plus's written reviews are positive against 57% of Duct Calculator's, so the app with the better star average is not the one people write more warmly about.

HVAC Pipe Sizer Plus ships an update every 15 months, Duct Calculator every 2 months. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer Plus | Duct Calculator |
| --- | --- | --- |
| Price | **$13.99** | $19.99 |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594/reviews) | **[4.5 (189 ratings)](https://appshunter.io/ios/app/duct-calculator/id1078238132/reviews)** |
| Number of ratings | 1 | **189** |
| Positive reviews | **66.7% of reviews** | 57.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 2 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Pheinex, LLC](https://appshunter.io/developer/996932317) |

## What reviewers say

### HVAC Pipe Sizer Plus

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594)

This utility app combines three specialized pipe sizing tools for HVAC systems: liquid, steam, and gas. It offers flexible input options, unit conversions, and an equipment locator for comprehensive HVAC design.

**Highlights:** Liquid pipe sizing, Steam pipe sizing with steam table calculator, Gas pipe sizing (low and high pressure), HVAC Equipment Locator, Slider controls for input adjustments, English and Metric unit display

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

**In-app purchases:** none


### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator/id1078238132)

This app allows HVAC professionals to quickly and accurately size new ducts or calculate the performance of existing ones. It supports both round and rectangular ductwork, offering precise calculations through direct entry or intuitive sliders. The tool provides live updates and outputs key performance metrics.

**Highlights:** Size round and rectangular ductwork, Adjust airflow, diameter, width, and height, Direct number entry for precision, Lockable dimensions for 'what-if' scenarios, Live update of calculated values, Outputs velocity and pressure drop, Supports IP and SI units

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer Plus free?

HVAC Pipe Sizer Plus costs $13.99, with no in-app purchases.

### Is Duct Calculator free?

Duct Calculator costs $19.99, with no in-app purchases.

### Which has better reviews, HVAC Pipe Sizer Plus or Duct Calculator?

Duct Calculator is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while Duct Calculator averages 4.5 from 189 ratings.

### Do HVAC Pipe Sizer Plus or Duct Calculator have ads?

Neither HVAC Pipe Sizer Plus nor Duct Calculator shows ads.

### Which is updated more often, HVAC Pipe Sizer Plus or Duct Calculator?

HVAC Pipe Sizer Plus ships an update every 15 months, and Duct Calculator every 2 months. Most recently, HVAC Pipe Sizer Plus was updated on October 27, 2026 and Duct Calculator on October 22, 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.*