# Rechenkönig vs Understanding Math

The clearest difference is update cadence: Understanding Math at every 11 months against Rechenkönig's every 39 months. Understanding Math also leads on iOS requirement (8.0 vs 12.0). Rechenkönig's advantage is price ($1.99 vs $3.99). On ads, in-app purchases and device support there is nothing between them.

Rechenkönig costs $1.99 and Understanding Math $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rechenkönig ships an update every 39 months, Understanding Math every 11 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Rechenkönig | Understanding Math |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Positive reviews | — | 78.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 11 months** |
| Monetization | — | Paid |
| Size | 10 MB | 37 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dr. Peter Schmidt](https://appshunter.io/developer/479165203) | [appp media UG](https://appshunter.io/developer/739118031) |

## What reviewers say

### Rechenkönig

[App page](https://appshunter.io/ios/app/rechenkonig/id494234897)

**Features:** macOS Compatibility

**In-app purchases:** none


### Understanding Math

[App page](https://appshunter.io/ios/app/understanding-math/id970643203)

This app offers interactive games and exercises to help children understand and practice addition and subtraction up to 100. It features multiple user profiles, progress tracking, and a competitive duel mode for engaging learning.

**Highlights:** Unlimited user profiles, Track child's achievements, Addition and subtraction up to 100, Four different game settings, Interactive learning methods, Duel mode for competition

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rechenkönig free?

Rechenkönig costs $1.99, with no in-app purchases.

### Is Understanding Math free?

Understanding Math costs $3.99, with no in-app purchases.

### Do Rechenkönig or Understanding Math have ads?

Neither Rechenkönig nor Understanding Math shows ads.

### Which is updated more often, Rechenkönig or Understanding Math?

Rechenkönig ships an update every 39 months, and Understanding Math every 11 months. Most recently, Rechenkönig was updated on November 1, 2026 and Understanding Math on November 1, 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.*