Substitutes vs PHP Akademie
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!
PHP Akademie
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Willkommen zur PHP Akademie, Ihrer Online Akademie. Funktionen: - Videovorträge: lernen und überprüfen Sie alle relevanten Konzepte schneller und einfacher - Lernmaterial: laden Sie Vortragsfolien für eine spätere Verwendung herunter - Spaced Repetition Quiz: stärken Sie Ihr Wissen mithilfe eines intelligenten Lernalgorithmus - Lesezeichen: organisieren Sie Vorträge in Ihren eigenen Listen - Studien Planer: planen Sie Ihre Lernziele - Lernfortschrittsanzeige: überprüfen Sie Ihren Fortschritt für jeden Kurs - Synchronisation zwischen allen Geräten: lernen Sie einfach nahtlos an einem anderen Gerät weiter - Offline-Verfügbarkeit: lernen Sie auch unterwegs - Notizen: erstellen Sie Notizen zu Ihren Vorträgen - Wiedergabegeschwindigkeit: passen Sie die Geschwindigkeit der Videos Ihrer Lerngeschwindigkeit an
Screenshots
Verdict
The clearest difference is iOS requirement: PHP Akademie at 15.0 against Substitutes's 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.
Substitutes ships an update every 3 months, PHP Akademie every 4 months. Both last shipped on October 7, 2026.
| Parameter | Substitutes | PHP Akademie |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 71.4% of reviews | — |
| Update frequency | Every 3 months — better | Every 4 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 | 117 MB |
| Age rating | 4+ | 17+ |
| Developer | Jan Wittler | Lecturio GmbH |
In-app purchases
Substitutes
No in-app purchases
PHP Akademie
No in-app purchases
Questions
Is Substitutes free?
Is PHP Akademie free?
Do Substitutes or PHP Akademie have ads?
Which is updated more often, Substitutes or PHP Akademie?
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