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 students, parents, and teachers with real-time access to school schedules, substitute classes, and important announcements. It facilitates communication, assignment submission, and resource sharing within the school community.
- Real-time schedules and substitute class information
- Digital parent letters and confirmations
- Assignment submission and material access
- Direct messaging with classmates and teachers
- Push notifications for important updates
- Support for multiple student accounts
- Dark and light design themes
Read full descriptionHide full description
Die OSG App bringt das Schulportal des Otto-Schott-Gymnasiums Mainz auf Smartphone und Tablet. Stundenplan, Vertretungen, Termine und Mitteilungen der Schule sind immer auf dem aktuellen Stand. Schülerinnen und Schüler sehen ihren Stundenplan, die Vertretungen, die Schul- und Kursarbeitstermine, ihre Fehlzeiten und die Liste der Lehrkräfte. Sie chatten mit Klasse und Lehrkräften, finden Material und geben Aufgaben in der Lernumgebung ab, lesen die Mitteilungen der Schule, planen ihre Wochenaufgaben im Lernbegleiter und nehmen an Videokonferenzen teil. Eltern erhalten Elternbriefe digital und bestätigen sie direkt in der App, sehen Stundenplan und Vertretungen ihres Kindes, behalten die Fehlzeiten im Blick, kennen alle Termine der Schule und chatten mit Lehrkräften. Lehrkräfte führen Klassen- und Kursbuch, erfassen Fehlzeiten, tragen Noten ins Notenbuch ein, chatten mit Klassen, Kursen und Kollegium und verschicken Mitteilungen und Elternbriefe. Bei Vertretungen, Stundenplanänderungen, neuen Chatnachrichten, Elternbriefen und neuem Material in der Lernumgebung kommt eine Push-Benachrichtigung. Jede Art lässt sich in den Einstellungen einzeln abschalten. Mehrere Konten, etwa für Geschwisterkinder, lassen sich in einer App nutzen. Dateien und Fotos können direkt aus anderen Apps ins Portal geteilt werden, und es gibt ein helles und ein dunkles Design. Die Anmeldung erfolgt mit den Zugangsdaten des Schulportals. Die App ist nur für Schülerinnen und Schüler, Eltern und Lehrkräfte des Otto-Schott-Gymnasiums Mainz nutzbar.
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
Read full descriptionHide full description
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 (15.4 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 November 6, 2026 and November 1, 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 | 15.4 — better | 18 |
| Further details — not scored | ||
| Size | 39 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
Questions
Is OSG App free?
Is Substitutes free?
Do OSG App or Substitutes have ads?
Which is updated more often, OSG App or Substitutes?
Other comparisons















