# Even or odd Mental calculation vs Smart Shape Puzzle

The clearest difference is in-app purchases: Smart Shape Puzzle at none against Even or odd Mental calculation's 1. Smart Shape Puzzle also leads on update cadence (every 5 days vs every 23 months) and iOS requirement (12.0 vs 15.0). On price, ads 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. Smart Shape Puzzle asks for nothing beyond the download.

Even or odd Mental calculation ships an update every 23 months, Smart Shape Puzzle every 5 days. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Even or odd Mental calculation | Smart Shape Puzzle |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 23 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 68 MB | 77 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Iker Vazquez](https://appshunter.io/developer/1032978250) | [Zimba oyun yazilimi anonim sirketi](https://appshunter.io/developer/1739087950) |

## 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 |


### Smart Shape Puzzle

[App page](https://appshunter.io/ios/app/smart-shape-puzzle/id6747585142)

**Features:** macOS Compatibility

**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 Smart Shape Puzzle free?

Smart Shape Puzzle is free to download, with no in-app purchases.

### Do Even or odd Mental calculation or Smart Shape Puzzle have ads?

Both Even or odd Mental calculation and Smart Shape Puzzle show ads.

### Which is updated more often, Even or odd Mental calculation or Smart Shape Puzzle?

Even or odd Mental calculation ships an update every 23 months, and Smart Shape Puzzle every 5 days. Most recently, Even or odd Mental calculation was updated on October 3, 2026 and Smart Shape Puzzle on October 16, 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.*