# O vs SL!NG

The clearest difference is in-app purchases: SL!NG at none against O's 1. O's advantage is iOS requirement (13.0 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. O sells 1 one-off in-app purchase. SL!NG asks for nothing beyond the download.

O ships an update weekly, SL!NG every 11 days. The most recent releases landed on October 17, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | O | SL!NG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (191 ratings)](https://appshunter.io/ios/app/o-void/id6449623550/reviews)** | — |
| Number of ratings | **191** | — |
| Positive reviews | 72.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 13 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Gearhead Games ApS](https://appshunter.io/developer/1163605497) | [Armin Miranda](https://appshunter.io/developer/6785915921) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-void/id6449623550)

Navigate a spinning circle through challenging obstacles in this minimal action runner. Levels dynamically change direction and flip, testing your reflexes. Compete globally and unlock customizations.

**Highlights:** One-tap gameplay, Mind-bending geometry, Randomly generated levels, Chiptune soundtrack, Unlockable customizations, Global leaderboards

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $2.99 | one-time |

**What reviewers like**

- 🎶 Great music/soundtrack
- 🎮 Challenging and satisfying gameplay
- 💡 Innovative game mechanics
- 💯 High skill ceiling/mastery
- ✨ Simple yet addictive

**What reviewers complain about**

- 😵 Dizzying/makes users sick
- 🥵 Extremely difficult/too hard
- ⏳ Too short/lacks content
- 😵‍💫 Trippy and weird visuals
- 🤢 Makes users feel sick

**Reported bugs**

- Spinning makes users sick
- Obstacles in later levels require luck/insane reaction time
- Effect does not disappear properly in penultimate level
- Game is glitchy, laggy, and unresponsive
- Revive ad doesn't work/can't close ad

**Requested features**

- Add more levels
- New dimension/different gameplay principle
- User level creator
- More beats/music synchronization
- Option to turn down color brightness


### SL!NG

[App page](https://appshunter.io/ios/app/slng/id6787027850)

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

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is SL!NG free?

SL!NG is free to download, with no in-app purchases.

### Do O or SL!NG have ads?

Both O and SL!NG show ads.

### Which is updated more often, O or SL!NG?

O ships an update weekly, and SL!NG every 11 days. Most recently, O was updated on October 17, 2026 and SL!NG on October 5, 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.*