# Quietflex Ductulator vs Ductulator

The clearest difference is in-app purchases: Quietflex Ductulator at none against Ductulator's 2. Quietflex Ductulator also leads on rating (5.0 vs 4.5) and update cadence (every 3 days vs every 8 months). Ductulator's advantage is ratings volume (36 vs 1). On price, ads 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. Quietflex Ductulator asks for nothing beyond the download.

Quietflex Ductulator holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Ductulator has 36 ratings behind it against 1, so its average is the more settled of the two.

Quietflex Ductulator ships an update every 3 days, Ductulator every 8 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Quietflex Ductulator | Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quietflex-ductulator/id1490925984/reviews)** | [4.5 (36 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews) |
| Number of ratings | 1 | **36** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 8 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 42 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Goodman Manufacturing L.P.](https://appshunter.io/developer/1485904991) | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) |

## 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


### 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 |


## Frequently asked questions

### Is Quietflex Ductulator free?

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

### Is Ductulator free?

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

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

Quietflex Ductulator is rated higher. Quietflex Ductulator averages 5.0 out of 5 from 1 ratings, while Ductulator averages 4.5 from 36 ratings.

### Do Quietflex Ductulator or Ductulator have ads?

Neither Quietflex Ductulator nor Ductulator shows ads.

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

Quietflex Ductulator ships an update every 3 days, and Ductulator every 8 months. Most recently, Quietflex Ductulator was updated on November 3, 2026 and Ductulator on November 5, 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.*