# LKS Library vs Mental Math

The clearest difference is in-app purchases: LKS Library at none against Mental Math's 3. LKS Library also leads on iOS requirement (11.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 3 in-app purchases, starting at $3.99 per month. LKS Library asks for nothing beyond the download.

## The numbers

| Metric | LKS Library | Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (3 ratings)](https://appshunter.io/ios/app/mental-math-calmenta/id6790559635/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Monetization | — | Freemium |
| Size | 93 MB | 73 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 12+ | 4+ |
| Developer | [Openserve Co.,Ltd.](https://appshunter.io/developer/479158615) | [HelloProg](https://appshunter.io/developer/1866892083) |

## What reviewers say

### LKS Library

[App page](https://appshunter.io/ios/app/lks-library/id1588021253)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-calmenta/id6790559635)

This app transforms mental math practice into an engaging game. Solve calculations by writing answers directly on the screen, track progress with badges and records, and enjoy a child-friendly, ad-free experience with parental controls.

**Highlights:** Finger-based answer input, Timed calculation challenges, Multiple math operations, Progress tracking with badges, Parental controls and profiles, Ad-free and no data collection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Abonnement annuel | $9.99 | per year |
| Premium à vie | $22.99 | one-time |


## Frequently asked questions

### Is LKS Library free?

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

### Is Mental Math free?

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

### Do LKS Library or Mental Math have ads?

Neither LKS Library nor Mental Math 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.*