# Calculation Triangle vs Das Zahlenbuch Schulversion

The clearest difference is price: Calculation Triangle at $0.99 against Das Zahlenbuch Schulversion's $9.99. Calculation Triangle also leads on iOS requirement (6.0 vs 12.0). Das Zahlenbuch Schulversion's advantage is review sentiment (50% vs 30%) and update cadence (every 7 months vs every 21 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Calculation Triangle costs $0.99 and Das Zahlenbuch Schulversion $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calculation Triangle ships an update every 21 months, Das Zahlenbuch Schulversion every 7 months. The most recent releases landed on September 21, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Calculation Triangle | Das Zahlenbuch Schulversion |
| --- | --- | --- |
| Price | **$0.99** | $9.99 |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/calculation-triangle/id575736731/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 30.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 7 months** |
| Monetization | Paid | Paid |
| Size | 22 MB | 65 MB |
| Requires iOS | **6.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christian Urff](https://appshunter.io/developer/415894463) | [Ernst Klett Verlag GmbH, Stuttgart](https://appshunter.io/developer/751540887) |

## What reviewers say

### Calculation Triangle

[App page](https://appshunter.io/ios/app/calculation-triangle/id575736731)

This virtual manipulative helps develop flexible arithmetic thinking. Users can create puzzles, model problems, and explore number relationships by adding, moving, and hiding tokens within a calculation triangle.

**Highlights:** Virtual calculation triangle manipulative, Token manipulation for arithmetic, Create and solve number puzzles, Hide/show fields and numbers, Shake to clear the triangle, Explore number relationships

**Features:** macOS Compatibility

**In-app purchases:** none


### Das Zahlenbuch Schulversion

[App page](https://appshunter.io/ios/app/das-zahlenbuch-schulversion/id1607119395)

This educational app provides interactive math practice for elementary school students, covering all four grade levels. It offers engaging exercises, visual aids, and immediate feedback to reinforce learning. The app is designed for easy use in both classroom and home settings, promoting digital literacy and independent study.

**Highlights:** Interactive math exercises for grades 1-4, Covers 6 central topics per school year, Visual support tools, Immediate feedback on solutions, Progress tracking for educators and parents, Offline usability

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculation Triangle free?

Calculation Triangle costs $0.99, with no in-app purchases.

### Is Das Zahlenbuch Schulversion free?

Das Zahlenbuch Schulversion costs $9.99, with no in-app purchases.

### Do Calculation Triangle or Das Zahlenbuch Schulversion have ads?

Neither Calculation Triangle nor Das Zahlenbuch Schulversion shows ads.

### Which is updated more often, Calculation Triangle or Das Zahlenbuch Schulversion?

Calculation Triangle ships an update every 21 months, and Das Zahlenbuch Schulversion every 7 months. Most recently, Calculation Triangle was updated on September 21, 2026 and Das Zahlenbuch Schulversion on September 26, 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.*