# Lernserver vs Rechenfeld

The clearest difference is price: Lernserver at Free against Rechenfeld's $0.99. Lernserver also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.6). Rechenfeld's advantage is in-app purchases (none vs 4) and update cadence (every 5 months vs every 17 months). On ads there is nothing between them.

Lernserver is free to download; Rechenfeld costs $0.99 up front. Lernserver sells 3 one-off in-app purchases. Rechenfeld asks for nothing beyond the download.

Lernserver ships an update every 17 months, Rechenfeld every 5 months. The most recent releases landed on September 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Lernserver | Rechenfeld |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 5 months** |
| Monetization | — | Paid |
| Size | 58 MB | 17 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lernserver](https://appshunter.io/developer/1481559642) | [Christian Urff](https://appshunter.io/developer/415894463) |

## What reviewers say

### Lernserver

[App page](https://appshunter.io/ios/app/lernserver/id1481559643)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Testeingabe (LS-Team) | $1.99 | one-time |
| Diagnose (kompakt) | $3.99 | one-time |
| Diagnose und Testeingabe | $5.99 | one-time |


### 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 Lernserver free?

Lernserver is free to download, with in-app purchases available.

### Is Rechenfeld free?

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

### Do Lernserver or Rechenfeld have ads?

Neither Lernserver nor Rechenfeld shows ads.

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

Lernserver ships an update every 17 months, and Rechenfeld every 5 months. Most recently, Lernserver was updated on September 26, 2026 and Rechenfeld on October 7, 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.*