# Even or odd Mental calculation vs LogicSums

The clearest difference is in-app purchases: LogicSums at none against Even or odd Mental calculation's 1. LogicSums also leads on update cadence (fortnightly vs every 23 months) and iOS requirement (13.0 vs 15.0). On price, review sentiment, 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. LogicSums asks for nothing beyond the download.

Even or odd Mental calculation ships an update every 23 months, LogicSums fortnightly. The most recent releases landed on October 3, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Even or odd Mental calculation | LogicSums |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 23 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 68 MB | 100 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Iker Vazquez](https://appshunter.io/developer/1032978250) | [Skillshot Games LLC](https://appshunter.io/developer/1700568662) |

## 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 |


### LogicSums

[App page](https://appshunter.io/ios/app/logicsums/id6741501245)

Engage in logic-based math puzzles by arranging numbers in a grid to meet target sums. This game offers endless challenges for brain training and mental workouts, perfect for puzzle enthusiasts.

**Highlights:** Logic-based math puzzles, Number arrangement in grids, Target sum matching, Limited guesses per puzzle, Win and streak tracking, Fastest solve time recording

**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 LogicSums free?

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

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

Both Even or odd Mental calculation and LogicSums show ads.

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

Even or odd Mental calculation ships an update every 23 months, and LogicSums fortnightly. Most recently, Even or odd Mental calculation was updated on October 3, 2026 and LogicSums on September 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.*