# Erwin vs Odd One

The clearest difference is review sentiment: Odd One at 92% against Erwin's 0%. Odd One also leads on price (Free vs $4.99) and iOS requirement (17.0 vs 26.0). Erwin's advantage is chart position (#198 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

Odd One is free to download; Erwin costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Erwin ships an update every 8 days, Odd One weekly. The most recent releases landed on September 20, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Erwin | Odd One |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 0.0% of reviews | **91.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 days | **Weekly** |
| Monetization | Paid | **Free** |
| Best chart rank | **#198** | — |
| Size | 43 MB | 23 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tamas Bartal](https://appshunter.io/developer/896478676) | [Lucas Hesseldieck](https://appshunter.io/developer/6788079537) |

## What reviewers say

### Erwin

[App page](https://appshunter.io/ios/app/erwin-a-quantum-puzzle/id6761667185)

**Currently charting:** #198 Top Paid · Board (US App Store)

Experience a unique 3D sliding puzzle on a cube's six faces. Merge tiles, rotate the cube, and discover quantum effects like superposition and entanglement. Play with friends in multiplayer mode.

**Highlights:** 3D cube sliding puzzle, Tile merging and scoring, Quantum effects (superposition, entanglement), Cube rotation for multiple faces, Local multiplayer via Game Center, Universal app purchase

**Features:** Game Controller support, Vision Pro support

**In-app purchases:** none


### Odd One

[App page](https://appshunter.io/ios/app/odd-one/id6788079535)

A minimalist brain-training puzzle game where players identify the single tile that breaks a pattern in a grid. It offers four distinct game modes, including classic, arcade, endless, and daily challenges, all designed for calm, logical play.

**Highlights:** Four distinct game modes, Minimalist brain-training puzzles, Handcrafted and generated levels, No timer or time-based challenges, Color-assist mode for color-blind players, Light and dark mode, Calm piano soundtrack

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

**In-app purchases:** none


## Frequently asked questions

### Is Erwin free?

Erwin costs $4.99, with no in-app purchases.

### Is Odd One free?

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

### Do Erwin or Odd One have ads?

Neither Erwin nor Odd One shows ads.

### Which is updated more often, Erwin or Odd One?

Erwin ships an update every 8 days, and Odd One weekly. Most recently, Erwin was updated on September 20, 2026 and Odd One on September 23, 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.*