# Ductulator vs Duct Calculator

The clearest difference is rating: Duct Calculator at 4.7 against Ductulator's 1.0. Ductulator's advantage is in-app purchases (none vs 1) and update cadence (weekly vs every 10 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Duct Calculator sells 1 one-off in-app purchase. Ductulator asks for nothing beyond the download.

Duct Calculator holds the better App Store score, 4.7 against 1.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

Ductulator ships an update weekly, Duct Calculator every 10 months. The most recent releases landed on October 12, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Ductulator | Duct Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/ductulator/id1528030964/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6756908372/reviews)** |
| Number of ratings | 2 | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 14 MB | 44 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Simon Leroux](https://appshunter.io/developer/1513421859) | [Sachinbhai Surani](https://appshunter.io/developer/1838685550) |

## What reviewers say

### Ductulator

[App page](https://appshunter.io/ios/app/ductulator/id1528030964)

This app provides a simple and efficient tool for calculating the dimensions of square ventilation ducts. It's designed for engineers, architects, and contractors to generate data for mechanical ventilation, cooling, and HVAC projects. Quickly validate residential and commercial solutions with this easy-to-use calculator.

**Highlights:** Calculate equivalent round diameter of square ducts, Convert square duct dimensions by volume ratio, Provide metric equivalence, Validate residential and commercial solutions, Designed for engineers and architects

**Features:** macOS Compatibility

**In-app purchases:** none


### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6756908372)

This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.

**Highlights:** Calculate duct sizes using airflow (CFM) and velocity (FPM), Supports rectangular and round duct sizing in inches, Determine air flow rate in CFM, Calculate air velocity in FPM, Simple interface for fast on-site calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


## Frequently asked questions

### Is Ductulator free?

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

### Is Duct Calculator free?

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

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

Duct Calculator is rated higher. Ductulator averages 1.0 out of 5 from 2 ratings, while Duct Calculator averages 4.7 from 3 ratings.

### Do Ductulator or Duct Calculator have ads?

Neither Ductulator nor Duct Calculator shows ads.

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

Ductulator ships an update weekly, and Duct Calculator every 10 months. Most recently, Ductulator was updated on October 12, 2026 and Duct Calculator on October 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.*