# Crazy Maths. vs Even or odd Mental calculation

The clearest difference is in-app purchases: Crazy Maths. at none against Even or odd Mental calculation's 1. Crazy Maths. also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). Even or odd Mental calculation's advantage is update cadence (every 23 months vs every 64 months). On price and device support there is nothing between them.

Both are free to download. Even or odd Mental calculation sells 1 one-off in-app purchase. Crazy Maths. asks for nothing beyond the download.

Crazy Maths. ships an update every 64 months, Even or odd Mental calculation every 23 months. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Crazy Maths. | Even or odd Mental calculation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/crazy-maths/id963527104/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 64 months | **Every 23 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 26 MB | 68 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fernando Gonzalez Frias](https://appshunter.io/developer/582325220) | [Iker Vazquez](https://appshunter.io/developer/1032978250) |

## What reviewers say

### Crazy Maths.

[App page](https://appshunter.io/ios/app/crazy-maths/id963527104)

This app offers a fun way to learn and practice fundamental math skills. It covers addition, subtraction, multiplication, division, and number theory concepts through engaging exercises and game modes. Designed for self-improvement, it helps build arithmetic fluency and mental math strategies.

**Highlights:** Basic arithmetic practice, Number theory concepts, Multiplication table learning, Mental math strategies, Multiple difficulty levels, High scores and awards, Fun animations

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Crazy Maths. free?

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

### Is Even or odd Mental calculation free?

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

### Do Crazy Maths. or Even or odd Mental calculation have ads?

Even or odd Mental calculation shows ads; Crazy Maths. does not.

### Which is updated more often, Crazy Maths. or Even or odd Mental calculation?

Crazy Maths. ships an update every 64 months, and Even or odd Mental calculation every 23 months. Most recently, Crazy Maths. was updated on October 6, 2026 and Even or odd Mental calculation 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.*