# Nova Sling vs Erwin

The clearest difference is price: Nova Sling at Free against Erwin's $4.99. Nova Sling also leads on iOS requirement (16 vs 26.0). Erwin's advantage is update cadence (every 8 days vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

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

Nova Sling ships an update every 3 months, Erwin every 8 days. The most recent releases landed on October 6, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Nova Sling | Erwin |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 8 days** |
| Monetization | — | Paid |
| Size | 7 MB | 43 MB |
| Requires iOS | **16** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [登鹏 蒋](https://appshunter.io/developer/1881445519) | [Tamas Bartal](https://appshunter.io/developer/896478676) |

## What reviewers say

### Nova Sling

[App page](https://appshunter.io/ios/app/nova-sling/id6759943714)

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

**In-app purchases:** none


### 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 Nova Sling free?

Nova Sling is free to download, with no in-app purchases.

### Is Erwin free?

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

### Do Nova Sling or Erwin have ads?

Neither Nova Sling nor Erwin shows ads.

### Which is updated more often, Nova Sling or Erwin?

Nova Sling ships an update every 3 months, and Erwin every 8 days. Most recently, Nova Sling was updated on October 6, 2026 and Erwin on October 20, 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.*