# fluidity HD vs Particle Simulation

The clearest difference is review sentiment: fluidity HD at 73% against Particle Simulation's 25%. fluidity HD also leads on update cadence (every 2 months vs every 7 months) and iOS requirement (8.0 vs 12.0). Particle Simulation's advantage is rating (4.5 vs 3.7). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. fluidity HD sells 1 one-off in-app purchase and Particle Simulation sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Particle Simulation holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 124 and 46 respectively. Written reviews complicate that: 73% of fluidity HD's written reviews are positive against 25% of Particle Simulation's, so the app with the better star average is not the one people write more warmly about.

fluidity HD ships an update every 2 months, Particle Simulation every 7 months. The most recent releases landed on September 28, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | fluidity HD | Particle Simulation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (124 ratings)](https://appshunter.io/ios/app/fluidity-hd/id399403909/reviews) | **[4.5 (46 ratings)](https://appshunter.io/ios/app/particle-simulation-flow-sim/id6467405758/reviews)** |
| Number of ratings | **124** | 46 |
| Positive reviews | **73.3% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 24 MB | 132 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [nebulus design](https://appshunter.io/developer/351409194) | [Marvin Krueger](https://appshunter.io/developer/1152894281) |

## What reviewers say

### fluidity HD

[App page](https://appshunter.io/ios/app/fluidity-hd/id399403909)

Experience a beautiful, real-time fluid dynamics simulation. Control the flow and colors of liquids with intuitive touch gestures. Unlock advanced features like ambient audio and video output through an in-app purchase.

**Highlights:** Real-time fluid dynamics simulation, Interactive touch controls, Stunning color customization, Ambient audio (in-app purchase), Snapshot and video output (in-app purchase)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Unlock | $1.99 | one-time |

**What reviewers like**

- 🌈 Visually stunning and mesmerizing
- 🧘‍♀️ Calming and relaxing experience
- 🎨 Vibrant and customizable colors
- 👍 Great for kids and adults

**What reviewers complain about**

- 🐛 Crashes and freezes on some devices
- 🔇 Lack of audio/music features
- 💰 Paid version not worth the cost
- 🔋 High battery consumption

**Reported bugs**

- Crashes on double-tap
- Incompatible with newer iOS
- Stuck finger gestures

**Requested features**

- Add music/ambient sound options
- Ability to save/export creations
- More customization controls
- Support for latest iOS versions


### Particle Simulation

[App page](https://appshunter.io/ios/app/particle-simulation-flow-sim/id6467405758)

Explore a world of creativity and find tranquility with mesmerizing particle simulations. Interact with dynamic particles, customize their behavior, and create beautiful art impressions while listening to meditative music. It's a calming and creative outlet for stress reduction and self-expression.

**Highlights:** Dynamic particle simulation, Meditative music, Customizable parameters, Autopilot mode, Gyrosensor and haptic feedback, Capture and share creations, Save and load presets

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Particles PRO | $2.99 | per 7 days |
| Psychedelic magic \| monthly | $3.99 | per month |
| Particles PRO | $12.99 | per year |
| Psychedelic magic | $19.99 | one-time |


## Frequently asked questions

### Is fluidity HD free?

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

### Is Particle Simulation free?

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

### Which has better reviews, fluidity HD or Particle Simulation?

Particle Simulation is rated higher. fluidity HD averages 3.7 out of 5 from 124 ratings, while Particle Simulation averages 4.5 from 46 ratings.

### Do fluidity HD or Particle Simulation have ads?

Neither fluidity HD nor Particle Simulation shows ads.

### Which is updated more often, fluidity HD or Particle Simulation?

fluidity HD ships an update every 2 months, and Particle Simulation every 7 months. Most recently, fluidity HD was updated on September 28, 2026 and Particle Simulation on September 9, 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.*