# Sensory Activity Center vs Fluids & Particle Simulation

The clearest difference is review sentiment: Fluids & Particle Simulation at 90% against Sensory Activity Center's 50%. Fluids & Particle Simulation also leads on ratings volume (777 vs 3) and update cadence (monthly vs every 4 months). Sensory Activity Center's advantage is in-app purchases (none vs 8) and rating (5.0 vs 4.7). On price and ads there is nothing between them.

Both are free to download. Fluids & Particle Simulation sells 8 in-app purchases, starting at $2.99 per 7 days. Sensory Activity Center asks for nothing beyond the download.

Sensory Activity Center holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Fluids & Particle Simulation has 777 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 50% of Sensory Activity Center's written reviews are positive against 90% of Fluids & Particle Simulation's, so the app with the better star average is not the one people write more warmly about.

Sensory Activity Center ships an update every 4 months, Fluids & Particle Simulation monthly. The most recent releases landed on October 20, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Sensory Activity Center | Fluids & Particle Simulation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sensory-activity-center/id1504337010/reviews)** | [4.7 (777 ratings)](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221/reviews) |
| Number of ratings | 3 | **777** |
| Positive reviews | 50.0% of reviews | **89.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 272 MB | 189 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Les Bird](https://appshunter.io/developer/398917210) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Sensory Activity Center

[App page](https://appshunter.io/ios/app/sensory-activity-center/id1504337010)

Offers a range of visually engaging activities with calming music, designed for children with special needs. Interactions are simple, responding to taps with moving images and bright colors for endless sensory engagement.

**Highlights:** Visually stimulating activities, Relaxing music, Tap-responsive interactions, Moving images, Bright colors, No time limits

**Features:** macOS Compatibility

**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 Sensory Activity Center free?

Sensory Activity Center is free to download, 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, Sensory Activity Center or Fluids & Particle Simulation?

Sensory Activity Center is rated higher. Sensory Activity Center averages 5.0 out of 5 from 3 ratings, while Fluids & Particle Simulation averages 4.7 from 777 ratings.

### Do Sensory Activity Center or Fluids & Particle Simulation have ads?

Neither Sensory Activity Center nor Fluids & Particle Simulation shows ads.

### Which is updated more often, Sensory Activity Center or Fluids & Particle Simulation?

Sensory Activity Center ships an update every 4 months, and Fluids & Particle Simulation monthly. Most recently, Sensory Activity Center was updated on October 20, 2026 and Fluids & Particle Simulation on October 23, 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.*