# Viessmann Access vs iEMOS

The clearest difference is update cadence: iEMOS at monthly against Viessmann Access's every 4 months. Viessmann Access's advantage is iOS requirement (12 vs 15.0). 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.

Viessmann Access ships an update every 4 months, iEMOS monthly. The most recent releases landed on August 12, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Viessmann Access | iEMOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Size | 52 MB | 51 MB |
| Requires iOS | **12** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Viessmann IT Service GmbH](https://appshunter.io/developer/1801739683) | [KOMDAT GmbH](https://appshunter.io/developer/419305116) |

## What reviewers say

### Viessmann Access

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

**In-app purchases:** none


### iEMOS

[App page](https://appshunter.io/ios/app/iemos/id1583245657)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Viessmann Access free?

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

### Is iEMOS free?

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

### Do Viessmann Access or iEMOS have ads?

Neither Viessmann Access nor iEMOS shows ads.

### Which is updated more often, Viessmann Access or iEMOS?

Viessmann Access ships an update every 4 months, and iEMOS monthly. Most recently, Viessmann Access was updated on August 12, 2026 and iEMOS on September 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.*