# echopaint vs Chladni

The clearest difference is in-app purchases: echopaint at none against Chladni's 1. echopaint also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Chladni sells 1 one-off in-app purchase. echopaint asks for nothing beyond the download.

echopaint ships an update weekly, Chladni every 10 days. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | echopaint | Chladni |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 10 days |
| Size | 1 MB | 5 MB |
| Requires iOS | 17.4 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Riley Williams](https://appshunter.io/developer/1848023764) | [Takashi Nemoto](https://appshunter.io/developer/6790828928) |

## What reviewers say

### echopaint

[App page](https://appshunter.io/ios/app/echopaint/id6754354177)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 echopaint free?

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

### Is Chladni free?

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

### Do echopaint or Chladni have ads?

Chladni shows ads; echopaint does not.

### Which is updated more often, echopaint or Chladni?

echopaint ships an update weekly, and Chladni every 10 days. Most recently, echopaint was updated on October 16, 2026 and Chladni on October 24, 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.*