# Flash vs Number Gym

The clearest difference is in-app purchases: Flash at none against Number Gym's 3. Number Gym's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Number Gym sells 3 in-app purchases, starting at $1.99 per month. Flash asks for nothing beyond the download.

Flash ships an update every 3 months, Number Gym every 2 weeks. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Flash | Number Gym |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 29 MB | 65 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [yeeun seo](https://appshunter.io/developer/1634215603) | [Aleksandr Marenin](https://appshunter.io/developer/1893463101) |

## What reviewers say

### Flash

[App page](https://appshunter.io/ios/app/flash-mental-math/id1634215601)

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

**In-app purchases:** none


### Number Gym

[App page](https://appshunter.io/ios/app/number-gym-brain-training/id6762230661)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Annual | $9.99 | per year |
| Premium Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Flash free?

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

### Is Number Gym free?

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

### Do Flash or Number Gym have ads?

Flash shows ads; Number Gym does not.

### Which is updated more often, Flash or Number Gym?

Flash ships an update every 3 months, and Number Gym every 2 weeks. Most recently, Flash was updated on October 5, 2026 and Number Gym on October 10, 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.*