# Particle Simulation Visualizer vs Koi Pond

The clearest difference is in-app purchases: Koi Pond at none against Particle Simulation Visualizer's 2. Particle Simulation Visualizer's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Particle Simulation Visualizer sells 2 in-app purchases, starting at $3.99 per 7 days. Koi Pond asks for nothing beyond the download.

Particle Simulation Visualizer ships an update monthly, Koi Pond every 3 weeks. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Particle Simulation Visualizer | Koi Pond |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (8 ratings)](https://appshunter.io/ios/app/koi-pond-relaxing-fish/id6803509085/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 128 MB | 186 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marvin Krueger](https://appshunter.io/developer/1152894281) | [Guangzhou Leqi Trading Co., Ltd.](https://appshunter.io/developer/6773999614) |

## What reviewers say

### Particle Simulation Visualizer

[App page](https://appshunter.io/ios/app/particle-simulation-visualizer/id6765869491)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Particles PRO | $3.99 | per 7 days |
| Particles PRO | $24.99 | per year |


### Koi Pond

[App page](https://appshunter.io/ios/app/koi-pond-relaxing-fish/id6803509085)

Create and interact with a tranquil virtual koi pond. Feed your fish, customize the scenery, and enjoy a peaceful, visually engaging experience designed for relaxation.

**Highlights:** Interactive water ripples, Feed your koi, Unlock colorful koi varieties, Customize pond scenery, Relaxing atmosphere, Zen aquarium experience

**In-app purchases:** none


## Frequently asked questions

### Is Particle Simulation Visualizer free?

Particle Simulation Visualizer is free to download, with in-app purchases available.

### Is Koi Pond free?

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

### Do Particle Simulation Visualizer or Koi Pond have ads?

Koi Pond shows ads; Particle Simulation Visualizer does not.

### Which is updated more often, Particle Simulation Visualizer or Koi Pond?

Particle Simulation Visualizer ships an update monthly, and Koi Pond every 3 weeks. Most recently, Particle Simulation Visualizer was updated on October 18, 2026 and Koi Pond 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.*