# Optical illusion hypnosis vs Fluid Simulation

The clearest difference is update cadence: Fluid Simulation at weekly against Optical illusion hypnosis's every 5 months. Fluid Simulation also leads on rating (4.6 vs 4.2) and review sentiment (77% vs 55%). Optical illusion hypnosis's advantage is monetization model (ad-supported vs free with in-app purchases). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Optical illusion hypnosis sells 4 in-app purchases, starting at $3.49 per month and Fluid Simulation sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Fluid Simulation holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 955 and 712 respectively. Written reviews point the same way: 55% of Optical illusion hypnosis's written reviews are positive against 77% of Fluid Simulation's.

Optical illusion hypnosis ships an update every 5 months, Fluid Simulation weekly. The most recent releases landed on September 7, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Optical illusion hypnosis | Fluid Simulation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (955 ratings)](https://appshunter.io/ios/app/optical-illusion-hypnosis/id1198253298/reviews) | **[4.6 (712 ratings)](https://appshunter.io/ios/app/fluid-simulation-magic-fluids/id1555635445/reviews)** |
| Number of ratings | **955** | 712 |
| Positive reviews | 55.1% of reviews | **77.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 97 MB | 138 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Astrologic Games LTDA](https://appshunter.io/developer/1164665798) | [Viacheslav Khakhulin](https://appshunter.io/developer/558806761) |

## What reviewers say

### Optical illusion hypnosis

[App page](https://appshunter.io/ios/app/optical-illusion-hypnosis/id1198253298)

Experience a unique blend of visual wonder and mental relaxation with mesmerizing optical illusions. This app offers a calming space to unwind, escape stress, and find creative inspiration through captivating visuals and meditative experiences.

**Highlights:** Mesmerizing visual illusions, Relaxation Mode with ambient music, Create and share custom illusions, Learn the science behind perception, Customizable experience with soundtracks and timers

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Access | $3.49 | per month |
| Remove Ads | $1.99 | one-time |
| Extreme FX Pack | $1.99 | one-time |
| Color FX Pack | $1.99 | one-time |

**What reviewers like**

- 🤩 Hypnotizing effects
- 🧠 Interesting illusions
- 👍 App works as intended
- 🤯 Mind-bending experiences

**What reviewers complain about**

- 🤯 Can cause headaches/dizziness
- 💰 Too many ads
- 🔴 Stuck on red screen
- 🤔 Unclear instructions

**Reported bugs**

- App crashes or gets stuck on red screen
- Ads don't load properly, preventing access to other levels
- Inconsistent performance across devices

**Requested features**

- Add more variety of illusions
- Reduce ads or offer ad-free version
- Improve performance on older devices
- Add color/visual customization options


### Fluid Simulation

[App page](https://appshunter.io/ios/app/fluid-simulation-magic-fluids/id1555635445)

Transform your screen into a relaxing oasis with interactive fluid art, mesmerizing particle effects, and calming music. Engage in guided breathing exercises to reduce stress and enhance mindfulness. Customize your experience to create a personal sanctuary for relaxation and creativity.

**Highlights:** Mesmerizing fluid art creation, Dazzling particle and kaleidoscope effects, Soothing ambient music and soundscapes, Guided mindful breathing exercises, Customizable colors, intensity, and speed, Save creations as wallpapers

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $9.99 | per month |
| Yearly | $29.99 | per year |
| Premium | $34.99 | one-time |

**What reviewers like**

- 🌈 Relaxing and calming effects
- 🎨 Beautiful visuals and fluid dynamics
- 🕰️ Engaging to pass the time
- 🧘‍♀️ Helps with stress relief and meditation

**What reviewers complain about**

- 💰 Excessive ads and paywalls
- 🔌 Issues with app updates and compatibility
- ⏱️ Limited free usage time

**Reported bugs**

- App crashes or freezes after updates
- Notifications and ads causing disruptions

**Requested features**

- Ability to customize the visuals and audio
- Offline mode for use without internet connection
- More ASMR-like features for enhanced relaxation


## Frequently asked questions

### Is Optical illusion hypnosis free?

Optical illusion hypnosis is free to download, with in-app purchases available.

### Is Fluid Simulation free?

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

### Which has better reviews, Optical illusion hypnosis or Fluid Simulation?

Fluid Simulation is rated higher. Optical illusion hypnosis averages 4.2 out of 5 from 955 ratings, while Fluid Simulation averages 4.6 from 712 ratings.

### Do Optical illusion hypnosis or Fluid Simulation have ads?

Both Optical illusion hypnosis and Fluid Simulation show ads.

### Which is updated more often, Optical illusion hypnosis or Fluid Simulation?

Optical illusion hypnosis ships an update every 5 months, and Fluid Simulation weekly. Most recently, Optical illusion hypnosis was updated on September 7, 2026 and Fluid Simulation on September 20, 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.*