# Block Harmonics vs Slime Blocks

The clearest difference is in-app purchases: Block Harmonics at none against Slime Blocks's 5. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Slime Blocks sells 5 one-off in-app purchases. Block Harmonics asks for nothing beyond the download.

Block Harmonics ships an update every 9 days, Slime Blocks every 2 weeks. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Block Harmonics | Slime Blocks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 31 MB | 71 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) | [Mykola Ovcharenko](https://appshunter.io/developer/1755879685) |

## 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


### Slime Blocks

[App page](https://appshunter.io/ios/app/slime-blocks-block-puzzle/id6754824231)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Power-Up Pack | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |
| Mega Power-Up Pack | $1.99 | one-time |
| Premium Skin Bundle | $2.99 | one-time |
| Ultimate Bundle | $3.99 | one-time |


## Frequently asked questions

### Is Block Harmonics free?

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

### Is Slime Blocks free?

Slime Blocks is free to download, with in-app purchases available.

### Do Block Harmonics or Slime Blocks have ads?

Both Block Harmonics and Slime Blocks show ads.

### Which is updated more often, Block Harmonics or Slime Blocks?

Block Harmonics ships an update every 9 days, and Slime Blocks every 2 weeks. Most recently, Block Harmonics was updated on November 5, 2026 and Slime Blocks on November 9, 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.*