# OSG App vs Substitutes

The clearest difference is review sentiment: Substitutes at 71% against OSG App's 25%. OSG App's advantage is iOS requirement (15.0 vs 18). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 16, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | OSG App | Substitutes |
| --- | --- | --- |
| 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 | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 40 MB | 3 MB |
| Requires iOS | **15.0** | 18 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jan Philipp Dahms](https://appshunter.io/developer/1474942026) | [Jan Wittler](https://appshunter.io/developer/805834216) |

## 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


### Substitutes

[App page](https://appshunter.io/ios/app/substitutes/id805834213)

Access your school's substitution schedule directly on your iPhone or iPad. Stay updated automatically with timetable changes, even offline. You can also input your personal schedule for a consolidated view of all your classes and substitutions.

**Highlights:** Real-time substitution plan updates, Offline access to schedule, Personal timetable input, Automatic course synchronization, Supports schools across Germany

**In-app purchases:** none


## Frequently asked questions

### Is OSG App free?

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

### Is Substitutes free?

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

### Do OSG App or Substitutes have ads?

Neither OSG App nor Substitutes shows ads.

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

OSG App ships an update every 3 months, and Substitutes every 3 months. Most recently, OSG App was updated on September 16, 2026 and Substitutes on September 5, 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.*