# Number Boom Demo! vs Chess.clock

The clearest difference is iOS requirement: Number Boom Demo! at 10.0 against Chess.clock's 26.2. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Number Boom Demo! ships an update every 6 months, Chess.clock every 3 months. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Number Boom Demo! | Chess.clock |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 14 MB | 2 MB |
| Requires iOS | **10.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pavel Kremliakov](https://appshunter.io/developer/728734154) | [Lukas Paul Hering](https://appshunter.io/developer/1788259541) |

## What reviewers say

### Number Boom Demo!

[App page](https://appshunter.io/ios/app/number-boom-demo/id731924461)

Test your math skills by solving equations before time runs out. This game offers brain exercises and an endless mode to challenge your calculation speed and accuracy.

**Highlights:** Math skill training, Timed equation solving, Brain exercises, Endless mode, Single difficulty level

**Features:** macOS Compatibility

**In-app purchases:** none


### Chess.clock

[App page](https://appshunter.io/ios/app/chessclock/id6740070517)

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

**In-app purchases:** none


## Frequently asked questions

### Is Number Boom Demo! free?

Number Boom Demo! is free to download, with no in-app purchases.

### Is Chess.clock free?

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

### Do Number Boom Demo! or Chess.clock have ads?

Neither Number Boom Demo! nor Chess.clock shows ads.

### Which is updated more often, Number Boom Demo! or Chess.clock?

Number Boom Demo! ships an update every 6 months, and Chess.clock every 3 months. Most recently, Number Boom Demo! was updated on October 19, 2026 and Chess.clock on October 15, 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.*