# Klapp vs Blitzrechnen

The clearest difference is in-app purchases: Klapp at none against Blitzrechnen's 4. Klapp also leads on update cadence (weekly vs every 3 months) and review sentiment (40% vs 19%). Blitzrechnen's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Blitzrechnen sells 4 one-off in-app purchases. Klapp asks for nothing beyond the download.

Klapp ships an update weekly, Blitzrechnen every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Klapp | Blitzrechnen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (21 ratings)](https://appshunter.io/ios/app/klapp-school-communication/id1247557480/reviews)** | — |
| Number of ratings | **21** | — |
| Positive reviews | **40.0% of reviews** | 18.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 87 MB | 196 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Klapp GmbH](https://appshunter.io/developer/1247557479) | [Ernst Klett Verlag GmbH](https://appshunter.io/developer/751540887) |

## What reviewers say

### Klapp

[App page](https://appshunter.io/ios/app/klapp-school-communication/id1247557480)

This app streamlines communication between schools, parents, and students. It facilitates message and file sharing, manages appointments and absences, and integrates video conferencing, replacing traditional paper-based communication methods.

**Highlights:** Private messaging and chat, File sharing, Appointment and absence management, Calendar synchronization, Integrated video conferencing

**Features:** Vision Pro support

**In-app purchases:** none


### Blitzrechnen

[App page](https://appshunter.io/ios/app/blitzrechnen/id6444187170)

Practice math skills for grades 1-4 with adaptive exercises. Learn independently through engaging, game-like activities that reinforce concepts and build confidence. Offline access ensures continuous learning at home or in the classroom.

**Highlights:** Adaptive exercises for grades 1-4, Multiple difficulty levels, Self-assessment tests, Progress tracking for parents/teachers, Offline functionality, Engaging animations

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Klasse 1 | $2.99 | one-time |
| Blitzrechnen 4 | $2.99 | one-time |
| Klasse 2 | $2.99 | one-time |
| Klasse 3 | $2.99 | one-time |


## Frequently asked questions

### Is Klapp free?

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

### Is Blitzrechnen free?

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

### Do Klapp or Blitzrechnen have ads?

Neither Klapp nor Blitzrechnen shows ads.

### Which is updated more often, Klapp or Blitzrechnen?

Klapp ships an update weekly, and Blitzrechnen every 3 months. Most recently, Klapp was updated on October 29, 2026 and Blitzrechnen on October 24, 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.*