# Quick Mental Math Game vs LessonOS

The clearest difference is in-app purchases: Quick Mental Math Game at none against LessonOS's 4. Quick Mental Math Game also leads on iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. LessonOS sells 4 in-app purchases, starting at $4.99 per month. Quick Mental Math Game asks for nothing beyond the download.

## The numbers

| Metric | Quick Mental Math Game | LessonOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 days |
| Size | 20 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ajay Vellayapan](https://appshunter.io/developer/1795548622) | [Chumphon Jan Toolseram](https://appshunter.io/developer/1891557073) |

## What reviewers say

### Quick Mental Math Game

[App page](https://appshunter.io/ios/app/quick-mental-math-game/id6743128735)

**Features:** macOS Compatibility

**In-app purchases:** none


### LessonOS

[App page](https://appshunter.io/ios/app/lessonos-class-attendance/id6761799063)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LessonOS Pro Monthly | $4.99 | per month |
| LessonOS Pro Yearly | $39.99 | per year |
| Business Unlock | $29.99 | one-time |
| Pro Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Quick Mental Math Game free?

Quick Mental Math Game is free to download, with no in-app purchases.

### Is LessonOS free?

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

### Do Quick Mental Math Game or LessonOS have ads?

Neither Quick Mental Math Game nor LessonOS shows ads.

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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.*