# Relax Calm Feelsy Fluid vs Particle Simulation

The clearest difference is review sentiment: Relax Calm Feelsy Fluid at 68% against Particle Simulation's 25%. Relax Calm Feelsy Fluid also leads on update cadence (every 9 days vs every 7 months). Particle Simulation's advantage is ads (none vs shown) and rating (4.5 vs 4.0). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. Relax Calm Feelsy Fluid sells 3 in-app purchases, starting at $2.99 per 7 days and Particle Simulation sells 4 in-app purchases, starting at $3.99 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 4.0. Both are backed by a comparable volume of ratings — 73 and 46 respectively. Written reviews complicate that: 68% of Relax Calm Feelsy Fluid'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.

Relax Calm Feelsy Fluid ships an update every 9 days, Particle Simulation every 7 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | Relax Calm Feelsy Fluid | Particle Simulation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (73 ratings)](https://appshunter.io/ios/app/relax-calm-feelsy-fluid-touch/id1614559224/reviews) | **[4.5 (46 ratings)](https://appshunter.io/ios/app/particle-simulation-flow-sim/id6467405758/reviews)** |
| Number of ratings | **73** | 46 |
| Positive reviews | **68.1% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 7 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 172 MB | 132 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SMART WIDGET LABS COMPANY LIMITED](https://appshunter.io/developer/1561934122) | [Marvin Krueger](https://appshunter.io/developer/1152894281) |

## What reviewers say

### Relax Calm Feelsy Fluid

[App page](https://appshunter.io/ios/app/relax-calm-feelsy-fluid-touch/id1614559224)

Engage with colorful particles and unique fluids through touch-based interactions. This app offers a relaxing and visually stimulating experience with customizable elements and calming music. Create and share your art pieces as live wallpapers or GIFs.

**Highlights:** Interactive fluid and particle simulation, Customizable shapes and colors, Convert art to live wallpapers/GIFs, High-quality recording, Diversified calming music, Save and share creations

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $2.99 | per 7 days |
| Monthly Premium | $8.99 | per month |
| Lifetime Premium | $29.99 | one-time |

**What reviewers like**

- 😌 Calming and relaxing experience
- 😴 Helps with sleep
- 💖 Wonderful and therapeutic
- ✨ Soothing and relaxing
- 👍 Good for kids and adults

**What reviewers complain about**

- 💰 Requires payment/subscription
- 💸 Too expensive
- 😠 Greedy developers
- 😩 Free trial not worth it
- 😤 Interruptions in free version

**Reported bugs**

- Cannot uninstall payment
- Gems stuck on screen
- Login issues
- Trial prompts immediately

**Requested features**

- More free content
- Nature-themed colors
- Add features for fear-related stress
- Remove payment requirements


### 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 | $3.99 | per 7 days |
| Psychedelic magic \| monthly | $3.99 | per month |
| Particles PRO | $17.99 | per year |
| Psychedelic magic | $19.99 | one-time |


## Frequently asked questions

### Is Relax Calm Feelsy Fluid free?

Relax Calm Feelsy Fluid 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, Relax Calm Feelsy Fluid or Particle Simulation?

Particle Simulation is rated higher. Relax Calm Feelsy Fluid averages 4.0 out of 5 from 73 ratings, while Particle Simulation averages 4.5 from 46 ratings.

### Do Relax Calm Feelsy Fluid or Particle Simulation have ads?

Relax Calm Feelsy Fluid shows ads; Particle Simulation does not.

### Which is updated more often, Relax Calm Feelsy Fluid or Particle Simulation?

Relax Calm Feelsy Fluid ships an update every 9 days, and Particle Simulation every 7 months. Most recently, Relax Calm Feelsy Fluid was updated on October 30, 2026 and Particle Simulation on October 30, 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.*