# Optical Illusions vs Odd Machines

The clearest difference is review sentiment: Odd Machines at 61% against Optical Illusions's 0%. Odd Machines also leads on ads (none vs shown) and update cadence (every 2 months vs every 19 months). Optical Illusions's advantage is in-app purchases (none vs 3). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Odd Machines sells 3 one-off in-app purchases. Optical Illusions asks for nothing beyond the download.

Optical Illusions ships an update every 19 months, Odd Machines every 2 months. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Optical Illusions | Odd Machines |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (89 ratings)](https://appshunter.io/ios/app/odd-machines-mechanical-boxes/id6737251986/reviews)** |
| Number of ratings | — | **89** |
| Positive reviews | 0.0% of reviews | **61.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 19 months | **Every 2 months** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 149 MB | 436 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 9+ |
| Developer | [Rocketship Studios LLP](https://appshunter.io/developer/1456752660) | [XSGames](https://appshunter.io/developer/1725979641) |

## 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


### Odd Machines

[App page](https://appshunter.io/ios/app/odd-machines-mechanical-boxes/id6737251986)

Embark on a 3D escape room adventure as a treasure hunter seeking a lost artifact. Solve intricate mechanical puzzles, uncover hidden objects, and unravel mysteries within an ancient temple. Collect fragments of a powerful stone to escape.

**Highlights:** Solve unique puzzle boxes, Explore an ancient temple, Collect fragments of a lost stone, Immersive audio experience, Multi-language support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game | $3.99 | one-time |
| Unlock Full Game + Coffee | $4.99 | one-time |
| Unlock Full Game + Love | $7.99 | one-time |

**What reviewers like**

- 🤔 Makes you think
- 💡 Ingenious puzzles
- ✨ Beautiful graphics
- 🎶 Soothing sounds and music
- 🎯 Logical puzzles

**What reviewers complain about**

- 🤏 Tiny text size
- 🖱️ Frustrating click accuracy
- ❓ Clues sometimes random
- 💰 Overpriced for content
- 🚫 Game doesn't work

**Reported bugs**

- No stone to collect from 5th window
- Game closes immediately on 'play'
- Bug in first machine, stone disappears
- Cannot zoom on puzzle
- Cannot actuate dials

**Requested features**

- Full game should be free
- Monocle usable at zoomed out level
- More visual feedback for puzzle completion
- Option to get the answer when hint isn't enough
- More levels/unlimited levels


## Frequently asked questions

### Is Optical Illusions free?

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

### Is Odd Machines free?

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

### Do Optical Illusions or Odd Machines have ads?

Optical Illusions shows ads; Odd Machines does not.

### Which is updated more often, Optical Illusions or Odd Machines?

Optical Illusions ships an update every 19 months, and Odd Machines every 2 months. Most recently, Optical Illusions was updated on October 13, 2026 and Odd Machines on October 25, 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.*