# Duct Sensor Assistant vs Hidria Fan

The clearest difference is update cadence: Duct Sensor Assistant at every 6 months against Hidria Fan's every 21 months. Duct Sensor Assistant also leads on iOS requirement (12.0 vs 14.1). 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, Hidria Fan every 21 months. The most recent releases landed on October 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Duct Sensor Assistant | Hidria Fan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 21 months |
| Size | 31 MB | 20 MB |
| Requires iOS | **12.0** | 14.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BELIMO Automation AG](https://appshunter.io/developer/1149281298) | [Hidria d.o.o.](https://appshunter.io/developer/1598522572) |

## What reviewers say

### Duct Sensor Assistant

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Hidria Fan

[App page](https://appshunter.io/ios/app/hidria-fan/id1598522570)

**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 Hidria Fan free?

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

### Do Duct Sensor Assistant or Hidria Fan have ads?

Neither Duct Sensor Assistant nor Hidria Fan shows ads.

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

Duct Sensor Assistant ships an update every 6 months, and Hidria Fan every 21 months. Most recently, Duct Sensor Assistant was updated on October 6, 2026 and Hidria Fan on October 30, 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.*