# Cat4School vs Rechenfeld

The clearest difference is price: Cat4School at Free against Rechenfeld's $0.99. Cat4School also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.6). On update cadence, ads and in-app purchases there is nothing between them.

Cat4School is free to download; Rechenfeld costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Cat4School ships an update every 8 months, Rechenfeld every 5 months. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Cat4School | Rechenfeld |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 months** |
| Monetization | — | Paid |
| Size | 21 MB | 17 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christoph Brecht](https://appshunter.io/developer/1456160595) | [Christian Urff](https://appshunter.io/developer/415894463) |

## What reviewers say

### Cat4School

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

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

**In-app purchases:** none


### Rechenfeld

[App page](https://appshunter.io/ios/app/rechenfeld/id1558366734)

This app provides a visual aid for understanding addition and subtraction within various number ranges. It's designed to help children, especially those with learning difficulties, grasp mathematical concepts through interactive manipulation of virtual objects.

**Highlights:** Visualizes addition and subtraction, Supports number ranges up to 1000, Interactive manipulation of virtual tiles, Helps develop number sense and strategies, Illustrates decimal system concepts, Displays problems on number line and arrow diagrams

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cat4School free?

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

### Is Rechenfeld free?

Rechenfeld costs $0.99, with no in-app purchases.

### Do Cat4School or Rechenfeld have ads?

Neither Cat4School nor Rechenfeld shows ads.

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

Cat4School ships an update every 8 months, and Rechenfeld every 5 months. Most recently, Cat4School was updated on October 20, 2026 and Rechenfeld on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*