# Substitutes vs Cat4School

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.

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.

## The numbers

| Metric | Substitutes | Cat4School |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 11 months |
| Monetization | Free | — |
| Size | 3 MB | 21 MB |
| Requires iOS | 18 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jan Wittler](https://appshunter.io/developer/805834216) | [Christoph Brecht](https://appshunter.io/developer/1456160595) |

## What reviewers say

### 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


### Cat4School

[App page](https://appshunter.io/ios/app/cat4school/id1478512295)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Substitutes free?

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

### Is Cat4School free?

Cat4School is free to download, with no in-app purchases.

### Do Substitutes or Cat4School have ads?

Neither Substitutes nor Cat4School shows ads.

### Which is updated more often, Substitutes or Cat4School?

Substitutes ships an update every 3 months, and Cat4School every 11 months. Most recently, Substitutes was updated on September 5, 2026 and Cat4School on September 16, 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.*