# Block Harmonics vs CatBlock

The clearest difference is ads: CatBlock at none against Block Harmonics's shown. Block Harmonics's advantage is update cadence (weekly vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Block Harmonics ships an update weekly, CatBlock every 3 weeks. Both last shipped on September 10, 2026.

## The numbers

| Metric | Block Harmonics | CatBlock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 33 MB | 105 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ikuya Terasaka](https://appshunter.io/developer/1163471139) | [kouryou cho](https://appshunter.io/developer/1893279296) |

## What reviewers say

### Block Harmonics

[App page](https://appshunter.io/ios/app/block-harmonics/id6752220613)

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

**In-app purchases:** none


### CatBlock

[App page](https://appshunter.io/ios/app/catblock/id6762186550)

**In-app purchases:** none


## Frequently asked questions

### Is Block Harmonics free?

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

### Is CatBlock free?

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

### Do Block Harmonics or CatBlock have ads?

Block Harmonics shows ads; CatBlock does not.

### Which is updated more often, Block Harmonics or CatBlock?

Block Harmonics ships an update weekly, and CatBlock every 3 weeks. Most recently, Block Harmonics was updated on September 10, 2026 and CatBlock on September 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.*