# Pythagorea vs Even or odd Mental calculation

The clearest difference is ads: Pythagorea at none against Even or odd Mental calculation's shown. Pythagorea also leads on update cadence (every 2 months vs every 23 months) and iOS requirement (8.0 vs 15.0). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Pythagorea sells 3 one-off in-app purchases and Even or odd Mental calculation sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Pythagorea ships an update every 2 months, Even or odd Mental calculation every 23 months. The most recent releases landed on November 1, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Pythagorea | Even or odd Mental calculation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1K ratings)](https://appshunter.io/ios/app/pythagorea/id994864779/reviews)** | — |
| Number of ratings | **1K** | — |
| Positive reviews | 94.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 23 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 91 MB | 68 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HORIS INTERNATIONAL LIMITED](https://appshunter.io/developer/646324304) | [Iker Vazquez](https://appshunter.io/developer/1032978250) |

## What reviewers say

### Pythagorea

[App page](https://appshunter.io/ios/app/pythagorea/id994864779)

Explore geometry through engaging puzzles on a squared grid. Solve over 350 tasks across 28 subjects, with over 70 terms defined in an accessible glossary. This app offers a friendly interface to train your mind and imagination.

**Highlights:** Over 350 geometric tasks, 28 subjects to explore, 70+ geometric terms glossary, Intuitive construction tools, Focus on natural laws, regularity, and symmetry, Friendly interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thanks to developers | $0.99 | one-time |
| Many thanks to developers | $4.99 | one-time |
| Many, many thanks to developers | $24.99 | one-time |

**What reviewers like**

- 👍 Engaging and fun puzzle game
- 💡 Challenging yet educational geometry puzzles
- 🚀 No ads or in-app purchases
- 🧠 Helps improve geometry and spatial skills
- 👍 Enjoyable for all ages

**What reviewers complain about**

- 🐛 Some puzzles may have unclear or incorrect instructions
- 💡 Lack of progress tracking or ability to skip puzzles
- 💡 No in-app solutions or hints when stuck
- 💡 Limited zoom functionality makes some puzzles difficult

**Reported bugs**

- Certain puzzles (e.g. 10.29) may have bugs in solution checking
- Compatibility issues on some older devices

**Requested features**

- Add progress tracking and ability to resume games
- Provide solutions or hints for puzzles
- Improve puzzle instructions and clarity
- Implement zoom functionality for better visibility


### Even or odd Mental calculation

[App page](https://appshunter.io/ios/app/even-or-odd-mental-calculation/id1032978251)

Test your mental math skills by quickly determining if the result of an on-screen operation is even or odd. Earn more points for faster answers and challenge friends to see who has the quickest mind. The difficulty increases as you progress.

**Highlights:** Timed mental calculation challenges, Score tracking for personal bests, Speed-based scoring system, Increasing difficulty levels, Multiplayer comparison

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version upgrade | $0.99 | one-time |


## Frequently asked questions

### Is Pythagorea free?

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

### Is Even or odd Mental calculation free?

Even or odd Mental calculation is free to download, with in-app purchases available.

### Do Pythagorea or Even or odd Mental calculation have ads?

Even or odd Mental calculation shows ads; Pythagorea does not.

### Which is updated more often, Pythagorea or Even or odd Mental calculation?

Pythagorea ships an update every 2 months, and Even or odd Mental calculation every 23 months. Most recently, Pythagorea was updated on November 1, 2026 and Even or odd Mental calculation on October 20, 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.*