# DfdS vs Rechenfeld

The clearest difference is price: DfdS at Free against Rechenfeld's $0.99. DfdS also leads on iOS requirement (12.0 vs 17.6). Rechenfeld's advantage is update cadence (every 5 months vs every 18 months). On ads, in-app purchases and device support there is nothing between them.

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

DfdS ships an update every 18 months, Rechenfeld every 5 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | DfdS | Rechenfeld |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 5 months** |
| Monetization | — | Paid |
| Size | 31 MB | 17 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Elke & Gunter Reimann-Dubbers Stiftung](https://appshunter.io/developer/1451814894) | [Christian Urff](https://appshunter.io/developer/415894463) |

## What reviewers say

### DfdS

[App page](https://appshunter.io/ios/app/dfds-grundschul-app/id1503057785)

**Features:** macOS Compatibility

**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 DfdS free?

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

### Is Rechenfeld free?

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

### Do DfdS or Rechenfeld have ads?

Neither DfdS nor Rechenfeld shows ads.

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

DfdS ships an update every 18 months, and Rechenfeld every 5 months. Most recently, DfdS was updated on November 7, 2026 and Rechenfeld on November 3, 2026.

---

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