# Aritmetica vs Even or odd Mental calculation

The clearest difference is in-app purchases: Aritmetica at none against Even or odd Mental calculation's 1. Aritmetica also leads on ads (none vs shown) and update cadence (monthly vs every 23 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. Aritmetica asks for nothing beyond the download.

Aritmetica ships an update monthly, Even or odd Mental calculation every 23 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Aritmetica | Even or odd Mental calculation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/aritmetica/id977817098/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 23 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 68 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Roberto Alcazar](https://appshunter.io/developer/977817097) | [Iker Vazquez](https://appshunter.io/developer/1032978250) |

## What reviewers say

### Aritmetica

[App page](https://appshunter.io/ios/app/aritmetica/id977817098)

Engage your mind with this math puzzle game. Solve a variety of operations using a limited set of numbers and operators across numerous levels. Compete on leaderboards and use hints when needed.

**Highlights:** Solve mathematical operations, 100 operations in 20 levels, Randomly generated puzzles, Scoring based on speed and accuracy, Hint and skip options, Game Center leaderboards

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

**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 Aritmetica free?

Aritmetica 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 Aritmetica or Even or odd Mental calculation have ads?

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

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

Aritmetica ships an update monthly, and Even or odd Mental calculation every 23 months. Most recently, Aritmetica was updated on November 1, 2026 and Even or odd Mental calculation on November 1, 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.*