# Duct Sensor Assistant vs RPEMS

Duct Sensor Assistant and RPEMS are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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, RPEMS every 10 months. The most recent releases landed on September 16, 2026 and May 13, 2026 respectively.

## The numbers

| Metric | Duct Sensor Assistant | RPEMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 10 months |
| Size | 31 MB | 13 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BELIMO Automation AG](https://appshunter.io/developer/1149281298) | [Jiangsu RCT Power Energy Technology Co., Ltd](https://appshunter.io/developer/1577284762) |

## What reviewers say

### Duct Sensor Assistant

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

**Features:** macOS Compatibility

**In-app purchases:** none


### RPEMS

[App page](https://appshunter.io/ios/app/rpems/id1598243104)

**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 RPEMS free?

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

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

Neither Duct Sensor Assistant nor RPEMS shows ads.

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

Duct Sensor Assistant ships an update every 6 months, and RPEMS every 10 months. Most recently, Duct Sensor Assistant was updated on September 16, 2026 and RPEMS on May 13, 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.*