# mos.viewer vs DiagramAI

The clearest difference is ads: mos.viewer at none against DiagramAI's shown. mos.viewer also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, 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, DiagramAI every 6 months. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | mos.viewer | DiagramAI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 6 months |
| Size | 23 MB | 149 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Fabrik 19 AG](https://appshunter.io/developer/501964744) | [Daniel Nowendsztern](https://appshunter.io/developer/1028876626) |

## What reviewers say

### mos.viewer

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

**In-app purchases:** none


### DiagramAI

[App page](https://appshunter.io/ios/app/diagramai/id6758946256)

**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 DiagramAI free?

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

### Do mos.viewer or DiagramAI have ads?

DiagramAI shows ads; mos.viewer does not.

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

mos.viewer ships an update every 4 months, and DiagramAI every 6 months. Most recently, mos.viewer was updated on October 14, 2026 and DiagramAI on October 12, 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.*