# mos.viewer vs Digia Preview

The clearest difference is update cadence: Digia Preview at every 3 weeks against mos.viewer's every 4 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.

mos.viewer ships an update every 4 months, Digia Preview every 3 weeks. The most recent releases landed on September 11, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | mos.viewer | Digia Preview |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 23 MB | 83 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Fabrik 19 AG](https://appshunter.io/developer/501964744) | [Digia Tech](https://appshunter.io/developer/1743914989) |

## What reviewers say

### mos.viewer

[App page](https://appshunter.io/ios/app/mosviewer/id6470921065)

**In-app purchases:** none


### Digia Preview

[App page](https://appshunter.io/ios/app/digia-preview/id6499570725)

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

**In-app purchases:** none


## Frequently asked questions

### Is mos.viewer free?

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

### Is Digia Preview free?

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

### Do mos.viewer or Digia Preview have ads?

Neither mos.viewer nor Digia Preview shows ads.

### Which is updated more often, mos.viewer or Digia Preview?

mos.viewer ships an update every 4 months, and Digia Preview every 3 weeks. Most recently, mos.viewer was updated on September 11, 2026 and Digia Preview on September 9, 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.*