# HVAC Duct Sizer vs Pipe Sizer

The clearest difference is rating: Pipe Sizer at 5.0 against HVAC Duct Sizer's 3.1. Pipe Sizer also leads on review sentiment (100% vs 63%) and in-app purchases (none vs 1). HVAC Duct Sizer's advantage is update cadence (every 3 months vs every 27 months) and ratings volume (9 vs 3). On ads, device support and iOS requirement there is nothing between them.

HVAC Duct Sizer costs $4.99 and Pipe Sizer $0.99 up front. HVAC Duct Sizer sells 1 one-off in-app purchase. Pipe Sizer asks for nothing beyond the download.

Pipe Sizer holds the better App Store score, 5.0 against 3.1. Both are backed by a comparable volume of ratings — 9 and 3 respectively. Written reviews point the same way: 63% of HVAC Duct Sizer's written reviews are positive against 100% of Pipe Sizer's.

HVAC Duct Sizer ships an update every 3 months, Pipe Sizer every 27 months. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC Duct Sizer | Pipe Sizer |
| --- | --- | --- |
| Price | $4.99 | **$0.99** |
| Rating | [3.1 (9 ratings)](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pipe-sizer-water-pipe-sizing/id1576656624/reviews)** |
| Number of ratings | **9** | 3 |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 27 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### HVAC Duct Sizer

[App page](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395)

This app provides quick and simple HVAC duct sizing analysis. It allows users to calculate duct dimensions based on airflow or existing dimensions, and can also determine a range of duct sizes. Results can be emailed for further analysis.

**Highlights:** Duct sizing by airflow, Duct sizing by dimensions, Range of duct sizes calculation, Rectangular, round, and oval duct shapes, English and Metric unit options, Email results with CSV attachment, HVAC Equipment Locator

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Pipe Sizer

[App page](https://appshunter.io/ios/app/pipe-sizer-water-pipe-sizing/id1576656624)

This utility app assists in selecting appropriate pipe diameters for water systems, supporting both pressure and gravity flow calculations. It offers automatic recommendations based on user-defined limits and incorporates multiple pipe materials and unit systems.

**Highlights:** Pressure pipe sizing, Gravity pipe sizing, Automatic pipe size recommendations, Multiple pipe material support, SI and Imperial units, Hazen-Williams and Manning equations

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Duct Sizer free?

HVAC Duct Sizer costs $4.99, and also offers in-app purchases.

### Is Pipe Sizer free?

Pipe Sizer costs $0.99, with no in-app purchases.

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

Pipe Sizer is rated higher. HVAC Duct Sizer averages 3.1 out of 5 from 9 ratings, while Pipe Sizer averages 5.0 from 3 ratings.

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

Neither HVAC Duct Sizer nor Pipe Sizer shows ads.

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

HVAC Duct Sizer ships an update every 3 months, and Pipe Sizer every 27 months. Most recently, HVAC Duct Sizer was updated on October 31, 2026 and Pipe Sizer on November 3, 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.*