# JHS Library vs Flash Mental Math

The clearest difference is ads: JHS Library at none against Flash Mental Math's shown. JHS Library also leads on iOS requirement (8.2 vs 15.6). Flash Mental Math's advantage is update cadence (every 3 months vs every 15 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JHS Library ships an update every 15 months, Flash Mental Math every 3 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | JHS Library | Flash Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (19 ratings)](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841/reviews)** |
| Number of ratings | — | **19** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | — | Ad-supported |
| Size | 30 MB | 14 MB |
| Requires iOS | **8.2** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Openserve Co.,Ltd.](https://appshunter.io/developer/479158615) | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) |

## What reviewers say

### JHS Library

[App page](https://appshunter.io/ios/app/jhs-library/id1373144994)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flash Mental Math

[App page](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841)

Practice mental arithmetic with various difficulty levels and custom modes. This app serves as a brain training tool to enhance calculation skills.

**Highlights:** Mental arithmetic practice, Easy, normal, and difficult modes, Customizable modes, Brain training, Calculation skill improvement

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

**In-app purchases:** none


## Frequently asked questions

### Is JHS Library free?

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

### Is Flash Mental Math free?

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

### Do JHS Library or Flash Mental Math have ads?

Flash Mental Math shows ads; JHS Library does not.

### Which is updated more often, JHS Library or Flash Mental Math?

JHS Library ships an update every 15 months, and Flash Mental Math every 3 months. Most recently, JHS Library was updated on October 26, 2026 and Flash Mental Math on October 27, 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.*