# HeatLoad Pro vs DuctSizer Pro

HeatLoad Pro and DuctSizer Pro are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. HeatLoad Pro sells 2 in-app purchases, starting at $29.99 per month and DuctSizer Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | HeatLoad Pro | DuctSizer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ductsizer-pro/id6772545249/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Monetization | — | Free |
| Size | 12 MB | 5 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Anthony Thome](https://appshunter.io/developer/1880459641) | [LEONARDO NOVOA](https://appshunter.io/developer/6772526007) |

## What reviewers say

### HeatLoad Pro

[App page](https://appshunter.io/ios/app/heatload-pro/id6759741110)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $29.99 | per month |
| Yearly | $199.99 | per year |


### 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 |


## Frequently asked questions

### Is HeatLoad Pro free?

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

### Is DuctSizer Pro free?

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

### Do HeatLoad Pro or DuctSizer Pro have ads?

Neither HeatLoad Pro nor DuctSizer Pro shows ads.

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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.*