# Duct Sensor Assistant vs FusionAir

The clearest difference is update cadence: Duct Sensor Assistant at every 6 months against FusionAir's every 12 months. FusionAir's advantage is iOS requirement (8.1 vs 12.0). 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.

Duct Sensor Assistant ships an update every 6 months, FusionAir every 12 months. The most recent releases landed on October 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Duct Sensor Assistant | FusionAir |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Size | 31 MB | 40 MB |
| Requires iOS | 12.0 | **8.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BELIMO Automation AG](https://appshunter.io/developer/1149281298) | [Cylon Controls Limited](https://appshunter.io/developer/1466854984) |

## What reviewers say

### Duct Sensor Assistant

[App page](https://appshunter.io/ios/app/duct-sensor-assistant/id1559862597)

**Features:** macOS Compatibility

**In-app purchases:** none


### FusionAir

[App page](https://appshunter.io/ios/app/fusionair/id1591987427)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duct Sensor Assistant free?

Duct Sensor Assistant is free to download, with no in-app purchases.

### Is FusionAir free?

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

### Do Duct Sensor Assistant or FusionAir have ads?

Neither Duct Sensor Assistant nor FusionAir shows ads.

### Which is updated more often, Duct Sensor Assistant or FusionAir?

Duct Sensor Assistant ships an update every 6 months, and FusionAir every 12 months. Most recently, Duct Sensor Assistant was updated on October 6, 2026 and FusionAir on November 7, 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.*