# Block Harmonics vs Gem Puzzle Island

The clearest difference is in-app purchases: Block Harmonics at none against Gem Puzzle Island's 8. Block Harmonics also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Gem Puzzle Island sells 8 one-off in-app purchases. Block Harmonics asks for nothing beyond the download.

Block Harmonics ships an update every 9 days, Gem Puzzle Island weekly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Block Harmonics | Gem Puzzle Island |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 9 days | **Weekly** |
| Size | 31 MB | 118 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ikuya Terasaka](https://appshunter.io/developer/1163471139) | [Ariya Studio Company Limited](https://appshunter.io/developer/323816951) |

## 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


### Gem Puzzle Island

[App page](https://appshunter.io/ios/app/gem-puzzle-island/id6785586799)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Coins | $0.99 | one-time |
| Starter Helper Pack | $0.99 | one-time |
| Gem Skin Pack | $0.99 | one-time |
| Medium Coins | $1.99 | one-time |
| All Themes Pack | $1.99 | one-time |
| Large Coins | $2.99 | one-time |
| Premium Bundle | $2.99 | one-time |
| Mega Coins | $3.99 | one-time |


## Frequently asked questions

### Is Block Harmonics free?

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

### Is Gem Puzzle Island free?

Gem Puzzle Island is free to download, with in-app purchases available.

### Do Block Harmonics or Gem Puzzle Island have ads?

Both Block Harmonics and Gem Puzzle Island show ads.

### Which is updated more often, Block Harmonics or Gem Puzzle Island?

Block Harmonics ships an update every 9 days, and Gem Puzzle Island weekly. Most recently, Block Harmonics was updated on October 30, 2026 and Gem Puzzle Island on October 28, 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.*