# Atomus HD vs Fluids & Particle Simulation

The clearest difference is price: Fluids & Particle Simulation at Free against Atomus HD's $1.99. Fluids & Particle Simulation also leads on update cadence (monthly vs every 3 months) and ratings volume (770 vs 60). Atomus HD's advantage is in-app purchases (none vs 8). On rating, review sentiment, ads and device support there is nothing between them.

Fluids & Particle Simulation is free to download; Atomus HD costs $1.99 up front. Fluids & Particle Simulation sells 8 in-app purchases, starting at $2.99 per 7 days. Atomus HD asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Atomus HD against 4.7 for Fluids & Particle Simulation. That said, the two scores are not equally well evidenced: Fluids & Particle Simulation has 770 ratings behind it against 60, so its average is the more settled of the two. Written reviews are what separate them: 91% of Atomus HD's written reviews are positive against 90% of Fluids & Particle Simulation's.

Atomus HD ships an update every 3 months, Fluids & Particle Simulation monthly. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Atomus HD | Fluids & Particle Simulation |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.8 (60 ratings)](https://appshunter.io/ios/app/atomus-hd/id741515911/reviews)** | [4.7 (770 ratings)](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221/reviews) |
| Number of ratings | 60 | **770** |
| Positive reviews | **90.7% of reviews** | 89.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 63 MB | 189 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [SungLab Inc](https://appshunter.io/developer/1691666995) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Atomus HD

[App page](https://appshunter.io/ios/app/atomus-hd/id741515911)

Experience a premium kinetic universe of light and motion with dynamic, evolving particle structures. This app offers a richer, more immersive visual experience perfect for creative focus, relaxation, or quiet exploration.

**Highlights:** Evolving light and motion structures, Richer particle density and flow, Smooth 60 FPS rendering, 10-finger multi-touch support, Adjustable particle settings, Multiple color modes, Ad-free experience

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

**In-app purchases:** none

**What reviewers like**

- ✨ Visually stunning graphics
- 🧘‍♀️ Relaxing and calming experience
- 🎨 Creative and mesmerizing visuals
- 🎶 Beautiful and soothing music
- 🎮 Addictive and engaging gameplay

**What reviewers complain about**

- ⏳ Can become boring after a while
- ❓ Lack of user manual/explanations
- 🎶 Music can be repetitive
- 💸 Some users feel it's a waste of money
- 🎛️ Limited customization options

**Reported bugs**

- App crashes with 11 fingers
- Orientation issues on tablets
- Music not working
- Sound stopped working
- App freezes after opening and exiting

**Requested features**

- User manual or explanations
- Ability to customize starting points
- Option to record or save favorite settings
- Ability to take screenshots
- More music tracks/playlists


### 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 Atomus HD free?

Atomus HD costs $1.99, 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, Atomus HD or Fluids & Particle Simulation?

Atomus HD is rated higher. Atomus HD averages 4.8 out of 5 from 60 ratings, while Fluids & Particle Simulation averages 4.7 from 770 ratings.

### Do Atomus HD or Fluids & Particle Simulation have ads?

Neither Atomus HD nor Fluids & Particle Simulation shows ads.

### Which is updated more often, Atomus HD or Fluids & Particle Simulation?

Atomus HD ships an update every 3 months, and Fluids & Particle Simulation monthly. Most recently, Atomus HD was updated on October 14, 2026 and Fluids & Particle Simulation on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*