# FlowCheck vs Duct Sensor Assistant

The clearest difference is update cadence: Duct Sensor Assistant at every 6 months against FlowCheck's every 15 months. Duct Sensor Assistant also leads on iOS requirement (12.0 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.

FlowCheck ships an update every 15 months, Duct Sensor Assistant every 6 months. The most recent releases landed on September 9, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | FlowCheck | Duct Sensor Assistant |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 6 months** |
| Size | 15 MB | 31 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TROX GmbH](https://appshunter.io/developer/968659913) | [BELIMO Automation AG](https://appshunter.io/developer/1149281298) |

## What reviewers say

### FlowCheck

[App page](https://appshunter.io/ios/app/flowcheck/id1501706128)

**Features:** Apple Wallet

**In-app purchases:** none


### Duct Sensor Assistant

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FlowCheck free?

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

### Is Duct Sensor Assistant free?

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

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

Neither FlowCheck nor Duct Sensor Assistant shows ads.

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

FlowCheck ships an update every 15 months, and Duct Sensor Assistant every 6 months. Most recently, FlowCheck was updated on September 9, 2026 and Duct Sensor Assistant on September 16, 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.*