Substitutes vs Cat4School
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!
Cat4School
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Die Schul-App für Schüler, Eltern, Lehrpersonen der Cat4School - Organisations- und Kommunikationsplattform.
Screenshots
Verdict
The clearest difference is update cadence: Substitutes at every 3 months against Cat4School's every 11 months. Cat4School's advantage is iOS requirement (15.0 vs 18). On price, ads, in-app purchases and device support 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.
Substitutes ships an update every 3 months, Cat4School every 11 months. The most recent releases landed on September 5, 2026 and September 16, 2026 respectively.
| Parameter | Substitutes | Cat4School |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 71.4% of reviews | — |
| Update frequency | Every 3 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 18 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Jan Wittler | Christoph Brecht |
In-app purchases
Substitutes
No in-app purchases
Cat4School
No in-app purchases
