# EWC Controls, LLC vs Quietflex Ductulator

The clearest difference is update cadence: Quietflex Ductulator at every 3 days against EWC Controls, LLC's every 9 days. Quietflex Ductulator also leads on iOS requirement (8.0 vs 16.4). EWC Controls, LLC's advantage is ratings volume (5 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for EWC Controls, LLC against 5.0 for Quietflex Ductulator. That said, the two scores are not equally well evidenced: EWC Controls, LLC has 5 ratings behind it against 1, so its average is the more settled of the two.

EWC Controls, LLC ships an update every 9 days, Quietflex Ductulator every 3 days. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | EWC Controls, LLC | Quietflex Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/ewc-controls-llc/id1456560692/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/quietflex-ductulator/id1490925984/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | Free | Free |
| Size | 38 MB | 30 MB |
| Requires iOS | 16.4 | **8.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [EWC Controls, Inc.](https://appshunter.io/developer/1456560691) | [Goodman Manufacturing L.P.](https://appshunter.io/developer/1485904991) |

## What reviewers say

### EWC Controls, LLC

[App page](https://appshunter.io/ios/app/ewc-controls-llc/id1456560692)

This app helps EWC contractors determine their zoning system requirements. It features a Bypass Calculator to recommend damper models and sizes, and a Control Panel Finder to suggest compatible control panels. Discover products and features to assist in setting up your zoning system.

**Highlights:** Bypass Damper Calculator, Control Panel Finder, Product Discovery, Zoning System Setup Assistance

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is EWC Controls, LLC free?

EWC Controls, LLC is free to download, with no in-app purchases.

### Is Quietflex Ductulator free?

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

### Which has better reviews, EWC Controls, LLC or Quietflex Ductulator?

EWC Controls, LLC and Quietflex Ductulator are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do EWC Controls, LLC or Quietflex Ductulator have ads?

Neither EWC Controls, LLC nor Quietflex Ductulator shows ads.

### Which is updated more often, EWC Controls, LLC or Quietflex Ductulator?

EWC Controls, LLC ships an update every 9 days, and Quietflex Ductulator every 3 days. Most recently, EWC Controls, LLC was updated on October 2, 2026 and Quietflex Ductulator on September 26, 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.*