# Seal One vs Viessmann Access

The clearest difference is update cadence: Viessmann Access at every 4 months against Seal One's every 9 months. 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.

Seal One ships an update every 9 months, Viessmann Access every 4 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Seal One | Viessmann Access |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Size | 10 MB | 52 MB |
| Requires iOS | 12.0 | 12 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seal One AG](https://appshunter.io/developer/1033883427) | [Viessmann IT Service GmbH](https://appshunter.io/developer/1801739683) |

## What reviewers say

### Seal One

[App page](https://appshunter.io/ios/app/seal-one/id1033883428)

**In-app purchases:** none


### Viessmann Access

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

**In-app purchases:** none


## Frequently asked questions

### Is Seal One free?

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

### Is Viessmann Access free?

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

### Do Seal One or Viessmann Access have ads?

Neither Seal One nor Viessmann Access shows ads.

### Which is updated more often, Seal One or Viessmann Access?

Seal One ships an update every 9 months, and Viessmann Access every 4 months. Most recently, Seal One was updated on October 29, 2026 and Viessmann Access on October 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.*