# Melink Cx vs CaptiveAire Toolbox

The clearest difference is update cadence: CaptiveAire Toolbox at every 6 days against Melink Cx's every 3 weeks. Melink Cx's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Melink Cx ships an update every 3 weeks, CaptiveAire Toolbox every 6 days. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Melink Cx | CaptiveAire Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/captiveaire-toolbox/id6765656560/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | — | Free |
| Size | 40 MB | 71 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Melink Corporation](https://appshunter.io/developer/1502723137) | [CaptiveAire Systems, Inc.](https://appshunter.io/developer/1896026735) |

## What reviewers say

### Melink Cx

[App page](https://appshunter.io/ios/app/melink-cx/id1572479180)

**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 Melink Cx free?

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

### Is CaptiveAire Toolbox free?

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

### Do Melink Cx or CaptiveAire Toolbox have ads?

Neither Melink Cx nor CaptiveAire Toolbox shows ads.

### Which is updated more often, Melink Cx or CaptiveAire Toolbox?

Melink Cx ships an update every 3 weeks, and CaptiveAire Toolbox every 6 days. Most recently, Melink Cx was updated on October 13, 2026 and CaptiveAire Toolbox on October 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.*