# Ductulator vs DuctSizer Pro

The clearest difference is rating: DuctSizer Pro at 5.0 against Ductulator's 4.5. DuctSizer Pro also leads on update cadence (weekly vs every 8 months) and monetization model (free vs free with in-app purchases). Ductulator's advantage is ratings volume (35 vs 3). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Ductulator sells 2 in-app purchases, starting at $4.99 per month and DuctSizer Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

DuctSizer Pro holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Ductulator has 35 ratings behind it against 3, so its average is the more settled of the two.

Ductulator ships an update every 8 months, DuctSizer Pro weekly. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Ductulator | DuctSizer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (35 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ductsizer-pro/id6772545249/reviews)** |
| Number of ratings | **35** | 3 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 42 MB | 5 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) | [LEONARDO NOVOA](https://appshunter.io/developer/6772526007) |

## What reviewers say

### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937)

This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.

**Highlights:** Duct sizing for round, rectangular, and flexible ducts, Fittings pressure drop calculation, Psychrometric analysis with interactive chart, Supports Imperial and Metric units, Pre-configured velocity limits for application types, Real-time validation warnings

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium | $4.99 | per month |
| premium | $29.99 | 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 Ductulator free?

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

### Is DuctSizer Pro free?

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

### Which has better reviews, Ductulator or DuctSizer Pro?

DuctSizer Pro is rated higher. Ductulator averages 4.5 out of 5 from 35 ratings, while DuctSizer Pro averages 5.0 from 3 ratings.

### Do Ductulator or DuctSizer Pro have ads?

Neither Ductulator nor DuctSizer Pro shows ads.

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

Ductulator ships an update every 8 months, and DuctSizer Pro weekly. Most recently, Ductulator was updated on October 31, 2026 and DuctSizer Pro on October 24, 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.*