# iPendulumWaves vs Chladni

The clearest difference is in-app purchases: iPendulumWaves at none against Chladni's 1. iPendulumWaves also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). Chladni's advantage is update cadence (every 10 days vs every 90 months). On price and ads there is nothing between them.

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

iPendulumWaves ships an update every 90 months, Chladni every 10 days. The most recent releases landed on September 25, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | iPendulumWaves | Chladni |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 90 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 1 MB | 5 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [fleron](https://appshunter.io/developer/549502195) | [Takashi Nemoto](https://appshunter.io/developer/6790828928) |

## What reviewers say

### iPendulumWaves

[App page](https://appshunter.io/ios/app/ipendulumwaves/id585690103)

Experience a 3D graphical simulation of "Pendulum Waves". Interact with the simulation using intuitive touch gestures for camera control, including dragging, pinching, and rotation. Double-tap to reset the camera to its default position.

**Highlights:** 3D graphical simulation, Pendulum Waves physics, 1-finger drag camera movement, 2-finger drag camera panning, Pinch to zoom camera, Rotation gesture for camera, Double tap to reset camera

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

**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 |
| --- | --- | --- |
| Watermark-free Wallpapers | $0.99 | one-time |


## Frequently asked questions

### Is iPendulumWaves free?

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

### Is Chladni free?

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

### Do iPendulumWaves or Chladni have ads?

Neither iPendulumWaves nor Chladni shows ads.

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

iPendulumWaves ships an update every 90 months, and Chladni every 10 days. Most recently, iPendulumWaves was updated on September 25, 2026 and Chladni on October 11, 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.*