# Pond Koi vs Fluids & Particle Simulation

The clearest difference is review sentiment: Fluids & Particle Simulation at 90% against Pond Koi's 31%. Fluids & Particle Simulation also leads on price (Free vs $2.99) and rating (4.7 vs 3.1). Pond Koi's advantage is in-app purchases (none vs 8) and chart position (#180 vs unranked). On update cadence, ads, device support and iOS requirement there is nothing between them.

Fluids & Particle Simulation is free to download; Pond Koi costs $2.99 up front. Fluids & Particle Simulation sells 8 in-app purchases, starting at $2.99 per 7 days. Pond Koi asks for nothing beyond the download.

Fluids & Particle Simulation holds the better App Store score, 4.7 against 3.1. That said, the two scores are not equally well evidenced: Fluids & Particle Simulation has 770 ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 31% of Pond Koi's written reviews are positive against 90% of Fluids & Particle Simulation's.

Pond Koi ships an update every 2 months, Fluids & Particle Simulation monthly. The most recent releases landed on September 6, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Pond Koi | Fluids & Particle Simulation |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.1 (16 ratings)](https://appshunter.io/ios/app/pond-koi/id642875147/reviews) | **[4.7 (770 ratings)](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221/reviews)** |
| Number of ratings | 16 | **770** |
| Positive reviews | 30.8% of reviews | **89.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#180** | — |
| Size | 228 MB | 189 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPhone, iPad, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [荣辉 张](https://appshunter.io/developer/517582330) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Pond Koi

[App page](https://appshunter.io/ios/app/pond-koi/id642875147)

**Currently charting:** #180 Top Paid · Entertainment (US App Store)

Create a serene digital pond with swimming koi, customizable backgrounds, and natural soundscapes. Interact with the fish, add flowers, and enjoy a stress-relieving visual and auditory experience.

**Highlights:** Realistic koi fish simulation, Customizable pond backgrounds, Interactive fish feeding and teasing, Variety of natural sound effects, Flower and leaf arrangement, Realistic water splashes and ripples

**Features:** Vision Pro support

**In-app purchases:** none


### Fluids & Particle Simulation

[App page](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221)

Create mesmerizing, psychedelic fluid art with your fingertips. This app offers a calming and creative outlet to reduce stress and channel negative emotions into beautiful, flowing patterns. Enjoy a unique ASMR experience with sound-reactive visuals and customizable parameters.

**Highlights:** Interactive fluid art simulation, Sound-reactive fluids, Dozens of customizable parameters, Autopilot mode, Gyrosensor and haptic feedback integration, Real-time sound synthesis, Video recording and screenshot functionality

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $2.99 | per 7 days |
| Unlock all \| monthly premium | $5.99 | per month |
| Fluids PRO | $17.99 | per year |
| Unlock all Presets (iOS) | $1.99 | one-time |
| Unlock all Presets (OS X Mac) | $2.99 | one-time |
| Unlock all features | $14.99 | one-time |
| Psychedelic magic (OS X Mac) | $24.99 | one-time |
| Psychedelic magic (iOS) | $44.99 | one-time |

**What reviewers like**

- 🚀 Mesmerizing visuals
- 👍 Relaxing and calming experience
- 🎨 Customizable color and fluid effects
- 🎶 Enjoyable audio/music integration
- 💡 Innovative and creative app concept

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔋 Device overheating issues
- 💰 Paid features may be too expensive
- 🔇 Lack of volume/audio control options

**Reported bugs**

- Microphone input not working as expected
- Difficulty resetting or restoring default settings

**Requested features**

- Ability to sync visuals with external audio/music
- More preset options and visual effects
- Improved UI/UX for settings and controls
- Support for casting to external displays


## Frequently asked questions

### Is Pond Koi free?

Pond Koi costs $2.99, with no in-app purchases.

### Is Fluids & Particle Simulation free?

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

### Which has better reviews, Pond Koi or Fluids & Particle Simulation?

Fluids & Particle Simulation is rated higher. Pond Koi averages 3.1 out of 5 from 16 ratings, while Fluids & Particle Simulation averages 4.7 from 770 ratings.

### Do Pond Koi or Fluids & Particle Simulation have ads?

Neither Pond Koi nor Fluids & Particle Simulation shows ads.

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

Pond Koi ships an update every 2 months, and Fluids & Particle Simulation monthly. Most recently, Pond Koi was updated on September 6, 2026 and Fluids & Particle Simulation on August 16, 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.*