# Viessmann Access vs QTRIX Viewer

The clearest difference is iOS requirement: Viessmann Access at 12 against QTRIX Viewer's 15.2. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Viessmann Access ships an update every 4 months, QTRIX Viewer every 6 months. The most recent releases landed on October 11, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Viessmann Access | QTRIX Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Size | 52 MB | 2 MB |
| Requires iOS | **12** | 15.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Viessmann IT Service GmbH](https://appshunter.io/developer/1801739683) | [Calidat GmbH](https://appshunter.io/developer/1477624591) |

## What reviewers say

### Viessmann Access

[App page](https://appshunter.io/ios/app/viessmann-access/id1533222623)

**In-app purchases:** none


### QTRIX Viewer

[App page](https://appshunter.io/ios/app/qtrix-viewer/id1606374309)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Viessmann Access free?

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

### Is QTRIX Viewer free?

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

### Do Viessmann Access or QTRIX Viewer have ads?

Neither Viessmann Access nor QTRIX Viewer shows ads.

### Which is updated more often, Viessmann Access or QTRIX Viewer?

Viessmann Access ships an update every 4 months, and QTRIX Viewer every 6 months. Most recently, Viessmann Access was updated on October 11, 2026 and QTRIX Viewer on September 27, 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.*