# Even or odd Mental calculation vs 1

The clearest difference is update cadence: 1 at weekly against Even or odd Mental calculation's every 23 months. Even or odd Mental calculation's advantage is iOS requirement (15.0 vs 18.5). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Even or odd Mental calculation ships an update every 23 months, 1 weekly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Even or odd Mental calculation | 1 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/1-100-blitz/id6801113150/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 23 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 68 MB | 4 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Iker Vazquez](https://appshunter.io/developer/1032978250) | [RYAN KEITH HERSHBERGER](https://appshunter.io/developer/6800993233) |

## 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 |


### 1

[App page](https://appshunter.io/ios/app/1-100-blitz/id6801113150)

A rapid number-tapping game where players race against the clock to find numbers 1 through 100. The objective is to locate each number in sequence before they disappear.

**Highlights:** Fast-paced gameplay, Number tapping challenge, Beat the clock mode, Sequential number finding, Improves reaction time

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bonus Levels | $0.99 | one-time |


## 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 1 free?

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

### Do Even or odd Mental calculation or 1 have ads?

Both Even or odd Mental calculation and 1 show ads.

### Which is updated more often, Even or odd Mental calculation or 1?

Even or odd Mental calculation ships an update every 23 months, and 1 weekly. Most recently, Even or odd Mental calculation was updated on October 20, 2026 and 1 on October 24, 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.*