# Even or odd Mental calculation vs Piyo Math

The clearest difference is in-app purchases: Piyo Math at none against Even or odd Mental calculation's 1. Piyo Math also leads on ads (none vs shown) and update cadence (every 2 months vs every 23 months). Even or odd Mental calculation's advantage is device support (3 vs 1). On price, review sentiment and iOS requirement there is nothing between them.

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

Even or odd Mental calculation ships an update every 23 months, Piyo Math every 2 months. The most recent releases landed on September 16, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Even or odd Mental calculation | Piyo Math |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 68 MB | 4 MB |
| Requires iOS | **15.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Iker Vazquez](https://appshunter.io/developer/1032978250) | [Daiki Kaneda](https://appshunter.io/developer/1675602625) |

## What reviewers say

### 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 |


### Piyo Math

[App page](https://appshunter.io/ios/app/piyo-math/id6446041886)

Engage your brain with a math game that challenges you to form equations using given numbers and four arithmetic operations to reach a target value. With over 8,000 problems across 12 difficulty levels, it offers extended playtime for math enthusiasts and brain trainers alike.

**Highlights:** Equation creation with four operations, Target value challenges, 12 difficulty levels, Over 8,000 problems, Brain training exercises

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

**In-app purchases:** none


## Frequently asked questions

### Is Even or odd Mental calculation free?

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

### Is Piyo Math free?

Piyo Math is free to download, with no in-app purchases.

### Do Even or odd Mental calculation or Piyo Math have ads?

Even or odd Mental calculation shows ads; Piyo Math does not.

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

Even or odd Mental calculation ships an update every 23 months, and Piyo Math every 2 months. Most recently, Even or odd Mental calculation was updated on September 16, 2026 and Piyo Math on September 12, 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.*