# DuctSizer Pro vs Ductulator

The clearest difference is device support: Ductulator at 3 against DuctSizer Pro's 1. Ductulator also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DuctSizer Pro sells 1 one-off in-app purchase and Ductulator sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

DuctSizer Pro ships an update weekly, Ductulator every 8 days. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | DuctSizer Pro | Ductulator |
| --- | --- | --- |
| 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** | Every 8 days |
| Monetization | Free | — |
| Size | 5 MB | 29 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LEONARDO NOVOA](https://appshunter.io/developer/6772526007) | [Foster Apps LLC](https://appshunter.io/developer/1836663142) |

## What reviewers say

### 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 |


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $3.99 | per 7 days |
| Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is DuctSizer Pro free?

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

### Is Ductulator free?

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

### Do DuctSizer Pro or Ductulator have ads?

Neither DuctSizer Pro nor Ductulator shows ads.

### Which is updated more often, DuctSizer Pro or Ductulator?

DuctSizer Pro ships an update weekly, and Ductulator every 8 days. Most recently, DuctSizer Pro was updated on October 24, 2026 and Ductulator on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*