# Even or odd Mental calculation vs Fraction Challenge

The clearest difference is ads: Fraction Challenge at none against Even or odd Mental calculation's shown. Fraction Challenge also leads on update cadence (every 2 months vs every 23 months) and iOS requirement (13.0 vs 15.0). Even or odd Mental calculation's advantage is review sentiment (100% vs 70%). On price, in-app purchases, monetization model 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 and Fraction Challenge 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, Fraction Challenge every 2 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Even or odd Mental calculation | Fraction Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (1.5K ratings)](https://appshunter.io/ios/app/fraction-challenge/id1499338364/reviews)** |
| Number of ratings | — | **1.5K** |
| Positive reviews | **100.0% of reviews** | 70.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 68 MB | 89 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Iker Vazquez](https://appshunter.io/developer/1032978250) | [Didactoons Games SL](https://appshunter.io/developer/1457185685) |

## 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 |


### Fraction Challenge

[App page](https://appshunter.io/ios/app/fraction-challenge/id1499338364)

Engage in fun math games designed to teach and reinforce fraction operations. Practice addition, subtraction, multiplication, and division of fractions through interactive challenges. Compete with friends in multiplayer mode to boost mental calculation skills.

**Highlights:** Fraction representation, Addition and subtraction of fractions, Equivalent fractions, Fraction reduction, Multiplication and division of fractions, Multiplayer mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get the Full version | $1.99 | one-time |

**What reviewers like**

- 👍 Helps with learning fractions
- 🚀 Fun and engaging game
- 💡 Good for practicing and preparing for tests
- 👍 Competitive and challenging

**What reviewers complain about**

- 🐛 App crashes or doesn't open
- 🕰️ Timer is too fast
- 💰 Not free to play

**Reported bugs**

- App crashes on launch
- Login issues

**Requested features**

- Option to remove timer or increase time
- More game modes (e.g., divided fractions, add/subtract fractions, multiply)
- No battery required to play


## 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 Fraction Challenge free?

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

### Do Even or odd Mental calculation or Fraction Challenge have ads?

Even or odd Mental calculation shows ads; Fraction Challenge does not.

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

Even or odd Mental calculation ships an update every 23 months, and Fraction Challenge every 2 months. Most recently, Even or odd Mental calculation was updated on November 1, 2026 and Fraction Challenge on November 7, 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.*