# Eco Mi vs Erwin

The clearest difference is price: Eco Mi at Free against Erwin's $4.99. Eco Mi also leads on iOS requirement (15.1 vs 26.0). Erwin's advantage is in-app purchases (none vs 7) and ads (none vs shown). On update cadence and device support there is nothing between them.

Eco Mi is free to download; Erwin costs $4.99 up front. Eco Mi sells 7 one-off in-app purchases. Erwin asks for nothing beyond the download.

Eco Mi ships an update every 9 days, Erwin every 8 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Eco Mi | Erwin |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/eco-mi-memory-game/id6761642110/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Every 8 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 63 MB | 43 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Frank Calise](https://appshunter.io/developer/1676853052) | [Tamas Bartal](https://appshunter.io/developer/896478676) |

## What reviewers say

### Eco Mi

[App page](https://appshunter.io/ios/app/eco-mi-memory-game/id6761642110)

Test your memory by watching and repeating color sequences. Features five unique game modes, including classic, timed, and reverse challenges. Compete on leaderboards, unlock achievements, and track your progress with a stats dashboard.

**Highlights:** Five distinct game modes, High score leaderboard, 16 unlockable achievements, Progress tracking dashboard, Customizable color themes and sound packs, Haptic feedback

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Retro Theme | $0.99 | one-time |
| Neon Theme | $0.99 | one-time |
| Pastel Theme | $0.99 | one-time |
| Retro Sound Pack | $0.99 | one-time |
| Buzzy Sound Pack | $0.99 | one-time |
| Mellow Sound Pack | $0.99 | one-time |
| Remove Ads | $2.99 | one-time |


### Erwin

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

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


## Frequently asked questions

### Is Eco Mi free?

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

### Is Erwin free?

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

### Do Eco Mi or Erwin have ads?

Eco Mi shows ads; Erwin does not.

### Which is updated more often, Eco Mi or Erwin?

Eco Mi ships an update every 9 days, and Erwin every 8 days. Most recently, Eco Mi was updated on October 25, 2026 and Erwin on October 24, 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.*