# DuctSizer vs HVAC Tools PT Chart

The clearest difference is price: HVAC Tools PT Chart at Free against DuctSizer's $4.99. DuctSizer's advantage is in-app purchases (none vs 3) and update cadence (every 4 days vs every 3 months). On ads there is nothing between them.

HVAC Tools PT Chart is free to download; DuctSizer costs $4.99 up front. HVAC Tools PT Chart sells 3 in-app purchases, starting at $4.99 per month. DuctSizer asks for nothing beyond the download.

DuctSizer ships an update every 4 days, HVAC Tools PT Chart every 3 months. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | DuctSizer | HVAC Tools PT Chart |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 months |
| Monetization | Paid | — |
| Size | 57 MB | 9 MB |
| Requires iOS | **12.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mulberrysoft](https://appshunter.io/developer/1612779919) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### DuctSizer

[App page](https://appshunter.io/ios/app/ductsizer/id6467117263)

This utility app provides a quick and accurate ductulator for calculating equivalent round and rectangular duct sizes. It supports both Imperial and SI units, offering a simple finger-slide interface for fast computations.

**Highlights:** Quick duct size calculations, Accurate results, Equivalent round and rectangular sizes, IP and SI unit support, Finger slide interface

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

**In-app purchases:** none


### HVAC Tools PT Chart

[App page](https://appshunter.io/ios/app/hvac-tools-pt-chart-gauge/id6760602879)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gauge Pro | $4.99 | per month |
| Gauge Pro | $39.99 | per year |
| Gauge Pro | $39.99 | per year |


## Frequently asked questions

### Is DuctSizer free?

DuctSizer costs $4.99, with no in-app purchases.

### Is HVAC Tools PT Chart free?

HVAC Tools PT Chart is free to download, with in-app purchases available.

### Do DuctSizer or HVAC Tools PT Chart have ads?

Neither DuctSizer nor HVAC Tools PT Chart shows ads.

### Which is updated more often, DuctSizer or HVAC Tools PT Chart?

DuctSizer ships an update every 4 days, and HVAC Tools PT Chart every 3 months. Most recently, DuctSizer was updated on October 14, 2026 and HVAC Tools PT Chart 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.*