# Quietflex Ductulator vs Digiduct

The clearest difference is update cadence: Quietflex Ductulator at every 3 days against Digiduct's every 2 months. Quietflex Ductulator also leads on rating (5.0 vs 4.6) and monetization model (free vs ad-supported). Digiduct's advantage is ratings volume (11 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Quietflex Ductulator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Digiduct has 11 ratings behind it against 1, so its average is the more settled of the two.

Quietflex Ductulator ships an update every 3 days, Digiduct every 2 months. The most recent releases landed on September 26, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Quietflex Ductulator | Digiduct |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quietflex-ductulator/id1490925984/reviews)** | [4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews) |
| Number of ratings | 1 | **11** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 30 MB | 4 MB |
| Requires iOS | **8.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Goodman Manufacturing L.P.](https://appshunter.io/developer/1485904991) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### Quietflex Ductulator

[App page](https://appshunter.io/ios/app/quietflex-ductulator/id1490925984)

This utility app helps HVAC professionals and enthusiasts quickly calculate essential airflow metrics for various duct sizes. It provides CFM, FPM, and FL values, simplifying HVAC system design and analysis.

**Highlights:** Calculate CFM, Calculate FPM, Calculate FL, Supports different duct diameters, HVAC system analysis

**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 Quietflex Ductulator free?

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

### Is Digiduct free?

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

### Which has better reviews, Quietflex Ductulator or Digiduct?

Quietflex Ductulator is rated higher. Quietflex Ductulator averages 5.0 out of 5 from 1 ratings, while Digiduct averages 4.6 from 11 ratings.

### Do Quietflex Ductulator or Digiduct have ads?

Neither Quietflex Ductulator nor Digiduct shows ads.

### Which is updated more often, Quietflex Ductulator or Digiduct?

Quietflex Ductulator ships an update every 3 days, and Digiduct every 2 months. Most recently, Quietflex Ductulator was updated on September 26, 2026 and Digiduct on October 1, 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.*