OSG App vs Substitutes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OSG App
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.
- Personalized class and substitute schedules
- Digital class register
- Absence management
- Push notifications for messages
- Quick portal connection
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Die OSG App ermöglicht eine schnelle Anbindung an das Portal des OSG Mainz. Stunden- und Vertretungspläne sind schnell und individualisiert verfügbar. Das digitale Klassenbuch- und Fehlzeitenmanagement ist ohne Probleme möglich. Für Chatnachrichten, Vertretungsplan-, Stundenplanänderungen und Elternbriefe werden Push Nachrichten verschickt.
Substitutes
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.
- Real-time substitution plan updates
- Offline access to schedule
- Personal timetable input
- Automatic course synchronization
- Supports schools across Germany
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Latest substitution plan directly for your iPhone and iPad. Stay up to date automatically and be aware of your timetable at all times! With your iOS device, you now have your substitution plan directly in your pocket － even offline － and are always up-to-date. You can also enter your own timetable and have everything in one app. Choose your school, enter your courses and that's all you need to be informed about all your substitutions. Your courses are automatically synchronised with the substitutions and displayed to you. No more annoying course matching, because from now on all you need to do is take a quick look at this app and you'll know when you have which substitutions. Substitutes supports schools all over Germany. The complete list can be viewed at https://vertretungen.wittler.app/en#schools. Your school is not supported yet? Send us an email to vertretungen@wittler.app with information about your school and the link to your online substitution plan. We hope to support your school as soon as possible!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | OSG App | Substitutes |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (3 ratings) — better | — |
| Positive reviews | 25.0% of reviews | 71.4% of reviews — better |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 18 |
| Further details — not scored | ||
| Size | 40 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Jan Philipp Dahms | Jan Wittler |
Customer experience
OSG App
Substitutes
In-app purchases
OSG App
No in-app purchases
Substitutes
No in-app purchases
