# Greenheck Toolbox vs Duct Calculator Elite

The clearest difference is review sentiment: Duct Calculator Elite at 50% against Greenheck Toolbox's 0%. Duct Calculator Elite also leads on rating (4.8 vs 3.0) and ratings volume (234 vs 2). Greenheck Toolbox's advantage is price (Free vs $9.99) and update cadence (every 2 months vs every 15 months). On ads, in-app purchases and device support there is nothing between them.

Greenheck Toolbox is free to download; Duct Calculator Elite costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Duct Calculator Elite holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Duct Calculator Elite has 234 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Greenheck Toolbox's written reviews are positive against 50% of Duct Calculator Elite's.

Greenheck Toolbox ships an update every 2 months, Duct Calculator Elite every 15 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Greenheck Toolbox | Duct Calculator Elite |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/greenheck-toolbox/id526779916/reviews) | **[4.8 (234 ratings)](https://appshunter.io/ios/app/duct-calculator-elite/id665701601/reviews)** |
| Number of ratings | 2 | **234** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 15 months |
| Monetization | **Free** | Paid |
| Size | 2 MB | 13 MB |
| Requires iOS | **7.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greenheck](https://appshunter.io/developer/526779919) | [Cyberprodigy LLC](https://appshunter.io/developer/510284906) |

## What reviewers say

### Greenheck Toolbox

[App page](https://appshunter.io/ios/app/greenheck-toolbox/id526779916)

This utility app provides two essential tools for HVAC professionals: a Fan Law Calculator to adjust fan performance based on changes in speed, and a Ductulator to quickly size ductwork. Easily calculate and determine duct dimensions and airflow with various input parameters.

**Highlights:** Fan Law Calculator, Ductulator App, Adjust fan performance, Size HVAC ductwork, Calculate airflow, Determine duct dimensions

**Features:** macOS Compatibility

**In-app purchases:** none


### Duct Calculator Elite

[App page](https://appshunter.io/ios/app/duct-calculator-elite/id665701601)

This app simplifies HVAC duct sizing calculations. It computes duct size, velocity, pressure drop, and flow rate with an intuitive interface. Supports various units and duct materials for precise HVAC design.

**Highlights:** Calculate duct size, velocity, pressure drop, flow rate, Duct Size by Airflow mode, Duct Size by Dimension mode, Pressure Drop calculations, Customizable units and duct materials, Uses ASHRAE Handbook friction loss equations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Greenheck Toolbox free?

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

### Is Duct Calculator Elite free?

Duct Calculator Elite costs $9.99, with no in-app purchases.

### Which has better reviews, Greenheck Toolbox or Duct Calculator Elite?

Duct Calculator Elite is rated higher. Greenheck Toolbox averages 3.0 out of 5 from 2 ratings, while Duct Calculator Elite averages 4.8 from 234 ratings.

### Do Greenheck Toolbox or Duct Calculator Elite have ads?

Neither Greenheck Toolbox nor Duct Calculator Elite shows ads.

### Which is updated more often, Greenheck Toolbox or Duct Calculator Elite?

Greenheck Toolbox ships an update every 2 months, and Duct Calculator Elite every 15 months. Most recently, Greenheck Toolbox was updated on November 1, 2026 and Duct Calculator Elite on November 6, 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.*