# Ductulate HD vs Digiduct

The clearest difference is price: Digiduct at Free against Ductulate HD's $7.99. Digiduct also leads on update cadence (every 2 months vs every 4 months). Ductulate HD's advantage is rating (4.9 vs 4.6) and iOS requirement (9.0 vs 26.2). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Digiduct is free to download; Ductulate HD costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ductulate HD holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 23 and 11 respectively.

Ductulate HD ships an update every 4 months, Digiduct every 2 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Ductulate HD | Digiduct |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.9 (23 ratings)](https://appshunter.io/ios/app/ductulate-hd/id441054001/reviews)** | [4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews) |
| Number of ratings | **23** | 11 |
| Positive reviews | 92.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 33 MB | 4 MB |
| Requires iOS | **9.0** | 26.2 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Steven Ramsay](https://appshunter.io/developer/415008343) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### Ductulate HD

[App page](https://appshunter.io/ios/app/ductulate-hd/id441054001)

This app helps HVAC engineers quickly calculate duct size, air volume, pressure loss, and velocity. It supports both imperial and metric units and offers features like scroll lock and customizable themes.

**Highlights:** Calculate duct size, air volume, pressure loss, velocity, Supports imperial and metric units, Scroll Lock for accidental touch prevention, Typical velocity reference chart, Customizable themes and company logo support, Favorite measurement markers

**Features:** macOS Compatibility

**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 Ductulate HD free?

Ductulate HD costs $7.99, with no in-app purchases.

### Is Digiduct free?

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

### Which has better reviews, Ductulate HD or Digiduct?

Ductulate HD is rated higher. Ductulate HD averages 4.9 out of 5 from 23 ratings, while Digiduct averages 4.6 from 11 ratings.

### Do Ductulate HD or Digiduct have ads?

Neither Ductulate HD nor Digiduct shows ads.

### Which is updated more often, Ductulate HD or Digiduct?

Ductulate HD ships an update every 4 months, and Digiduct every 2 months. Most recently, Ductulate HD was updated on October 6, 2026 and Digiduct on October 16, 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.*