# OSG App vs Cat4School

The clearest difference is update cadence: OSG App at every 3 months against Cat4School's every 11 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.

OSG App ships an update every 3 months, Cat4School every 11 months. Both last shipped on September 16, 2026.

## The numbers

| Metric | OSG App | Cat4School |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/osg-app/id792552698/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 11 months |
| Monetization | Free | — |
| Size | 40 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jan Philipp Dahms](https://appshunter.io/developer/1474942026) | [Christoph Brecht](https://appshunter.io/developer/1456160595) |

## What reviewers say

### OSG App

[App page](https://appshunter.io/ios/app/osg-app/id792552698)

This app provides quick access to the OSG Mainz portal, offering personalized class schedules and substitute plans. It facilitates digital class registers and absence management, with push notifications for messages and important updates.

**Highlights:** Personalized class and substitute schedules, Digital class register, Absence management, Push notifications for messages, Quick portal connection

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

**In-app purchases:** none


### Cat4School

[App page](https://appshunter.io/ios/app/cat4school/id1478512295)

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

**In-app purchases:** none


## Frequently asked questions

### Is OSG App free?

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

### Is Cat4School free?

Cat4School is free to download, with no in-app purchases.

### Do OSG App or Cat4School have ads?

Neither OSG App nor Cat4School shows ads.

### Which is updated more often, OSG App or Cat4School?

OSG App ships an update every 3 months, and Cat4School every 11 months. Most recently, OSG App was updated on September 16, 2026 and Cat4School on September 16, 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.*