# Math Bus vs KlankKr8 Op School

The clearest difference is price: KlankKr8 Op School at Free against Math Bus's $0.99. KlankKr8 Op School also leads on update cadence (monthly vs every 4 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

KlankKr8 Op School is free to download; Math Bus costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Math Bus ships an update every 4 months, KlankKr8 Op School monthly. The most recent releases landed on September 27, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Math Bus | KlankKr8 Op School |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Size | 18 MB | 460 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Henk Jurriens](https://appshunter.io/developer/524160208) | [RID](https://appshunter.io/developer/1507768954) |

## What reviewers say

### Math Bus

[App page](https://appshunter.io/ios/app/math-bus/id716831058)

**Features:** macOS Compatibility

**In-app purchases:** none


### KlankKr8 Op School

[App page](https://appshunter.io/ios/app/klankkr8-op-school/id6447011591)

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

**In-app purchases:** none


## Frequently asked questions

### Is Math Bus free?

Math Bus costs $0.99, with no in-app purchases.

### Is KlankKr8 Op School free?

KlankKr8 Op School is free to download, with no in-app purchases.

### Do Math Bus or KlankKr8 Op School have ads?

Neither Math Bus nor KlankKr8 Op School shows ads.

### Which is updated more often, Math Bus or KlankKr8 Op School?

Math Bus ships an update every 4 months, and KlankKr8 Op School monthly. Most recently, Math Bus was updated on September 27, 2026 and KlankKr8 Op School on October 5, 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.*