# Rechenfeld vs KOMBI

The clearest difference is price: KOMBI at Free against Rechenfeld's $0.99. KOMBI also leads on iOS requirement (11.0 vs 17.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 21, 2026 and December 9, 2025 respectively.

## The numbers

| Metric | Rechenfeld | KOMBI |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Paid | — |
| Size | 17 MB | 104 MB |
| Requires iOS | 17.6 | **11.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Urff](https://appshunter.io/developer/415894463) | [Karina Hoeveler](https://appshunter.io/developer/1626071083) |

## What reviewers say

### 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


### KOMBI

[App page](https://appshunter.io/ios/app/kombi/id1626071081)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rechenfeld free?

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

### Is KOMBI free?

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

### Do Rechenfeld or KOMBI have ads?

Neither Rechenfeld nor KOMBI shows ads.

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

Rechenfeld ships an update every 5 months, and KOMBI every 5 months. Most recently, Rechenfeld was updated on September 21, 2026 and KOMBI on December 9, 2025.

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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.*