# Pythagoras HD vs Cabri Express Primary

The clearest difference is price: Cabri Express Primary at Free against Pythagoras HD's $0.99. Cabri Express Primary also leads on update cadence (every 2 months vs every 24 months) and device support (4 vs 1). Pythagoras HD's advantage is iOS requirement (12.0 vs 14.0). On ads and in-app purchases there is nothing between them.

Cabri Express Primary is free to download; Pythagoras HD costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pythagoras HD ships an update every 24 months, Cabri Express Primary every 2 months. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Pythagoras HD | Cabri Express Primary |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/pythagoras-hd/id404432708/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 10 MB | 101 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Roman Koksharov](https://appshunter.io/developer/700716922) | [Cabrilog SAS](https://appshunter.io/developer/1058047739) |

## What reviewers say

### Pythagoras HD

[App page](https://appshunter.io/ios/app/pythagoras-hd/id404432708)

Explore the Pythagorean Theorem through interactive puzzles and visual proofs. This educational app offers a unique, formula-free approach to understanding geometry. It's designed to make learning engaging and accessible.

**Highlights:** Visual proofs of Pythagorean Theorem, Interactive geometric puzzles, Formula-free learning, Engaging educational experience, iPad compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


### Cabri Express Primary

[App page](https://appshunter.io/ios/app/cabri-express-primary/id1668145657)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pythagoras HD free?

Pythagoras HD costs $0.99, with no in-app purchases.

### Is Cabri Express Primary free?

Cabri Express Primary is free to download, with no in-app purchases.

### Do Pythagoras HD or Cabri Express Primary have ads?

Neither Pythagoras HD nor Cabri Express Primary shows ads.

### Which is updated more often, Pythagoras HD or Cabri Express Primary?

Pythagoras HD ships an update every 24 months, and Cabri Express Primary every 2 months. Most recently, Pythagoras HD was updated on October 11, 2026 and Cabri Express Primary on October 3, 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.*