# Duct Calculator vs Digiduct

The clearest difference is price: Digiduct at Free against Duct Calculator's $19.99. Duct Calculator's advantage is ratings volume (189 vs 11) and device support (4 vs 2). On rating, update cadence, ads and in-app purchases there is nothing between them.

Digiduct is free to download; Duct Calculator costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.5 for Duct Calculator against 4.6 for Digiduct. That said, the two scores are not equally well evidenced: Duct Calculator has 189 ratings behind it against 11, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Duct Calculator | Digiduct |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | [4.5 (189 ratings)](https://appshunter.io/ios/app/duct-calculator/id1078238132/reviews) | **[4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews)** |
| Number of ratings | **189** | 11 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 2 MB | 4 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pheinex, LLC](https://appshunter.io/developer/996932317) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator/id1078238132)

This app allows HVAC professionals to quickly and accurately size new ducts or calculate the performance of existing ones. It supports both round and rectangular ductwork, offering precise calculations through direct entry or intuitive sliders. The tool provides live updates and outputs key performance metrics.

**Highlights:** Size round and rectangular ductwork, Adjust airflow, diameter, width, and height, Direct number entry for precision, Lockable dimensions for 'what-if' scenarios, Live update of calculated values, Outputs velocity and pressure drop, Supports IP and SI units

**Features:** Vision Pro support

**In-app purchases:** none


### Digiduct

[App page](https://appshunter.io/ios/app/digiduct/id6738926359)

This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.

**Highlights:** Duct sizing for rectangular, round, and flat oval ducts, Customizable dimensions with locked values, Duct location intelligence for context-aware sizing, Calculations based on CFM, pressure drop, or velocity, Alerts for exceeding pressure drop or velocity limits

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

**In-app purchases:** none


## Frequently asked questions

### Is Duct Calculator free?

Duct Calculator costs $19.99, with no in-app purchases.

### Is Digiduct free?

Digiduct is free to download, with no in-app purchases.

### Which has better reviews, Duct Calculator or Digiduct?

Digiduct is rated higher. Duct Calculator averages 4.5 out of 5 from 189 ratings, while Digiduct averages 4.6 from 11 ratings.

### Do Duct Calculator or Digiduct have ads?

Neither Duct Calculator nor Digiduct shows ads.

### Which is updated more often, Duct Calculator or Digiduct?

Duct Calculator ships an update every 2 months, and Digiduct every 2 months. Most recently, Duct Calculator was updated on October 22, 2026 and Digiduct on October 24, 2026.

---

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