# Greenheck Toolbox vs CaptiveAire Toolbox

The clearest difference is rating: CaptiveAire Toolbox at 5.0 against Greenheck Toolbox's 3.0. CaptiveAire Toolbox also leads on update cadence (weekly vs every 2 months). Greenheck Toolbox's advantage is iOS requirement (7.0 vs 16.0). On price, ratings volume, 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.

CaptiveAire Toolbox holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Greenheck Toolbox ships an update every 2 months, CaptiveAire Toolbox weekly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Greenheck Toolbox | CaptiveAire Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/greenheck-toolbox/id526779916/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/captiveaire-toolbox/id6765656560/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | Free |
| Size | 2 MB | 71 MB |
| Requires iOS | **7.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Greenheck](https://appshunter.io/developer/526779919) | [Captive-Aire Systems, Inc.](https://appshunter.io/developer/1896026735) |

## 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


### CaptiveAire Toolbox

[App page](https://appshunter.io/ios/app/captiveaire-toolbox/id6765656560)

This app provides over 40 HVAC and building-systems engineering calculators. It's designed for field use, offering standard industry formulas for cooling, heating, ventilation, electrical sizing, and more. Access detailed formula definitions and reference data.

**Highlights:** 40+ HVAC engineering calculators, Cooling and heating load calculations, Ventilation and airflow tools, Electrical sizing and motor circuits, Duct and piping pressure drop, Reference data and psychrometric chart

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

**In-app purchases:** none


## Frequently asked questions

### Is Greenheck Toolbox free?

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

### Is CaptiveAire Toolbox free?

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

### Which has better reviews, Greenheck Toolbox or CaptiveAire Toolbox?

CaptiveAire Toolbox is rated higher. Greenheck Toolbox averages 3.0 out of 5 from 2 ratings, while CaptiveAire Toolbox averages 5.0 from 1 ratings.

### Do Greenheck Toolbox or CaptiveAire Toolbox have ads?

Neither Greenheck Toolbox nor CaptiveAire Toolbox shows ads.

### Which is updated more often, Greenheck Toolbox or CaptiveAire Toolbox?

Greenheck Toolbox ships an update every 2 months, and CaptiveAire Toolbox weekly. Most recently, Greenheck Toolbox was updated on October 21, 2026 and CaptiveAire Toolbox on October 24, 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.*