# Gravitarium vs Optical illusion hypnosis

The clearest difference is in-app purchases: Gravitarium at none against Optical illusion hypnosis's 4. Gravitarium also leads on ads (none vs shown) and review sentiment (82% vs 55%). On price, ratings volume and update cadence there is nothing between them.

Both are free to download. Optical illusion hypnosis sells 4 in-app purchases, starting at $3.49 per month. Gravitarium asks for nothing beyond the download.

Gravitarium holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 331 and 958 respectively. Written reviews point the same way: 82% of Gravitarium's written reviews are positive against 55% of Optical illusion hypnosis's.

Gravitarium ships an update every 3 months, Optical illusion hypnosis every 5 months. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Gravitarium | Optical illusion hypnosis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (331 ratings)](https://appshunter.io/ios/app/gravitarium/id741646894/reviews)** | [4.2 (958 ratings)](https://appshunter.io/ios/app/optical-illusion-hypnosis/id1198253298/reviews) |
| Number of ratings | 331 | **958** |
| Positive reviews | **81.8% of reviews** | 54.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Paid | **Ad-supported** |
| Size | 46 MB | 97 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple TV, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Scep Group LLC](https://appshunter.io/developer/1612838932) | [Astrologic Games LTDA](https://appshunter.io/developer/1164665798) |

## What reviewers say

### Gravitarium

[App page](https://appshunter.io/ios/app/gravitarium/id741646894)

Explore a world of dynamic particle animations controlled by your touch. Create stunning visual effects with up to 10 interactive formations and customize colors, animations, and sounds. Save, share, and even use your creations as parallax-optimized wallpapers.

**Highlights:** Multitouch particle control, 10 interactive formations, Customizable animations and colors, Save, edit, and share creations, Parallax wallpaper optimization, Voice and music reaction, Multiplayer drawing/flow

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 😌 Highly relaxing and calming experience
- 🧠 Excellent for ADHD, autism, and sensory processing
- 🎵 Soothing music and audio design
- 💰 Free version available with no ads
- 🎨 Visually satisfying particle effects

**What reviewers complain about**

- 💳 Paywall blocks many features
- 🐛 Occasional lag and glitches
- 🎵 iTunes music integration doesn't work properly
- 📱 Display issues on newer devices (iPhone X, XS Max)
- 🎨 Interface design could be improved

**Reported bugs**

- App crashes when playing music
- iTunes music upload fails despite paid version
- Game Center login not working
- Black bars on iPhone XS Max display
- Option bar doesn't show/retract properly

**Requested features**

- Custom music upload functionality
- Automatic music integration
- Support for newer screen resolutions
- iPhone X/XS Max compatibility
- More free features without paywall


### 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


## Frequently asked questions

### Is Gravitarium free?

Gravitarium is free to download, with no in-app purchases.

### Is Optical illusion hypnosis free?

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

### Which has better reviews, Gravitarium or Optical illusion hypnosis?

Gravitarium is rated higher. Gravitarium averages 4.5 out of 5 from 331 ratings, while Optical illusion hypnosis averages 4.2 from 958 ratings.

### Do Gravitarium or Optical illusion hypnosis have ads?

Optical illusion hypnosis shows ads; Gravitarium does not.

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

Gravitarium ships an update every 3 months, and Optical illusion hypnosis every 5 months. Most recently, Gravitarium was updated on October 29, 2026 and Optical illusion hypnosis on October 22, 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.*