# Optical Illusions vs Sleepy Sloth Categories

The clearest difference is review sentiment: Sleepy Sloth Categories at 100% against Optical Illusions's 0%. Sleepy Sloth Categories also leads on ads (none vs shown) and update cadence (weekly vs every 19 months). Optical Illusions's advantage is in-app purchases (none vs 2). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sleepy Sloth Categories sells 2 in-app purchases, starting at $3.99 per 7 days. Optical Illusions asks for nothing beyond the download.

Optical Illusions ships an update every 19 months, Sleepy Sloth Categories weekly. The most recent releases landed on October 13, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Optical Illusions | Sleepy Sloth Categories |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 19 months | **Weekly** |
| Monetization | **Ad-supported** | Freemium |
| Size | 149 MB | 52 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Rocketship Studios LLP](https://appshunter.io/developer/1456752660) | [Haglo Limited](https://appshunter.io/developer/1750895476) |

## 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


### Sleepy Sloth Categories

[App page](https://appshunter.io/ios/app/sleepy-sloth-categories/id6762382253)

A fast-paced, voice-powered party game where players race against the clock to name categories. Speak answers aloud to keep a sloth asleep, or risk waking him up. Features multiple themes and categories for endless fun.

**Highlights:** Voice-powered gameplay, Six distinct themes, Dozens of specific categories, Multiplayer mode, Free to play with starter content, Smart voice matching

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sleepy Sloth Pro | $3.99 | per 7 days |
| Sleepy Sloth Pro | $29.99 | per year |


## Frequently asked questions

### Is Optical Illusions free?

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

### Is Sleepy Sloth Categories free?

Sleepy Sloth Categories is free to download, with in-app purchases available.

### Do Optical Illusions or Sleepy Sloth Categories have ads?

Optical Illusions shows ads; Sleepy Sloth Categories does not.

### Which is updated more often, Optical Illusions or Sleepy Sloth Categories?

Optical Illusions ships an update every 19 months, and Sleepy Sloth Categories weekly. Most recently, Optical Illusions was updated on October 13, 2026 and Sleepy Sloth Categories on October 28, 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.*