# Optical Illusions vs Cocus

The clearest difference is in-app purchases: Optical Illusions at none against Cocus's 1. Cocus's advantage is ads (none vs shown) and update cadence (every 5 days vs every 19 months). On price and device support there is nothing between them.

Both are free to download. Cocus sells 1 one-off in-app purchase. Optical Illusions asks for nothing beyond the download.

Optical Illusions ships an update every 19 months, Cocus every 5 days. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Optical Illusions | Cocus |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 19 months | **Every 5 days** |
| Monetization | Ad-supported | — |
| Size | 149 MB | 104 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Rocketship Studios LLP](https://appshunter.io/developer/1456752660) | [juhan kim](https://appshunter.io/developer/1495289453) |

## What reviewers say

### Optical Illusions

[App page](https://appshunter.io/ios/app/optical-illusionsbrain-teaser/id1555733337)

Engage with a collection of mind-bending visual puzzles designed to challenge your perception and cognitive skills. Explore numerous optical illusions that will test your brain power and visual acuity in a fun and engaging way.

**Highlights:** Hundreds of optical illusion challenges, Spot trick questions and hidden traps, Minimal design for illusion clarity, Time-limited challenges, Suitable for all ages, IQ training and mind games

**In-app purchases:** none


### Cocus

[App page](https://appshunter.io/ios/app/cocus/id6445876591)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Deco Shop Full Pack | $1.99 | one-time |


## Frequently asked questions

### Is Optical Illusions free?

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

### Is Cocus free?

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

### Do Optical Illusions or Cocus have ads?

Optical Illusions shows ads; Cocus does not.

### Which is updated more often, Optical Illusions or Cocus?

Optical Illusions ships an update every 19 months, and Cocus every 5 days. Most recently, Optical Illusions was updated on September 30, 2026 and Cocus on September 29, 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.*