# Happy Patterns vs Chladni

The clearest difference is ads: Happy Patterns at none against Chladni's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Happy Patterns sells 4 one-off in-app purchases and Chladni sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Happy Patterns ships an update fortnightly, Chladni every 10 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Happy Patterns | Chladni |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 30 MB | 5 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SHASHANK S TOMAR](https://appshunter.io/developer/6772878453) | [Takashi Nemoto](https://appshunter.io/developer/6790828928) |

## What reviewers say

### Happy Patterns

[App page](https://appshunter.io/ios/app/happy-patterns/id6779627492)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Attractors | $3.99 | one-time |
| Mandalas | $3.99 | one-time |
| Bloom | $3.99 | one-time |
| Launch Collection | $7.99 | one-time |


### Chladni

[App page](https://appshunter.io/ios/app/chladni-sound-patterns/id6812944446)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads and Watermark | $0.99 | one-time |


## Frequently asked questions

### Is Happy Patterns free?

Happy Patterns is free to download, with in-app purchases available.

### Is Chladni free?

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

### Do Happy Patterns or Chladni have ads?

Chladni shows ads; Happy Patterns does not.

### Which is updated more often, Happy Patterns or Chladni?

Happy Patterns ships an update fortnightly, and Chladni every 10 days. Most recently, Happy Patterns was updated on November 5, 2026 and Chladni on October 31, 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.*