# Duct Calculator Pro vs Pipe Sizer

The clearest difference is rating: Pipe Sizer at 5.0 against Duct Calculator Pro's 1.0. Pipe Sizer also leads on update cadence (every 27 months vs every 72 months) and price ($0.99 vs $3.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

Duct Calculator Pro costs $3.99 and Pipe Sizer $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pipe Sizer holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Duct Calculator Pro ships an update every 72 months, Pipe Sizer every 27 months. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Duct Calculator Pro | Pipe Sizer |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pipe-sizer-water-pipe-sizing/id1576656624/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 72 months | **Every 27 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | 18.5 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### Duct Calculator Pro

[App page](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891)

This tool assists HVAC professionals and students with quick and precise calculations for duct sizing, airflow velocity, and airflow rate. It works offline and features a user-friendly interface for efficient project work.

**Highlights:** Duct size calculation, Airflow velocity (FPM) calculation, Airflow rate (CFM) calculation, Rectangular and round duct support, Offline functionality, Ad-free experience

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

**In-app purchases:** none


### 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 Duct Calculator Pro free?

Duct Calculator Pro costs $3.99, with no in-app purchases.

### Is Pipe Sizer free?

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

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

Pipe Sizer is rated higher. Duct Calculator Pro averages 1.0 out of 5 from 1 ratings, while Pipe Sizer averages 5.0 from 3 ratings.

### Do Duct Calculator Pro or Pipe Sizer have ads?

Neither Duct Calculator Pro nor Pipe Sizer shows ads.

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

Duct Calculator Pro ships an update every 72 months, and Pipe Sizer every 27 months. Most recently, Duct Calculator Pro was updated on October 17, 2026 and Pipe Sizer on October 20, 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.*