# Rytmos vs O

The clearest difference is rating: O at 4.6 against Rytmos's 3.6. O also leads on update cadence (weekly vs every 2 months) and review sentiment (72% vs 48%). Rytmos's advantage is ads (none vs shown) and chart position (#168 vs unranked). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Rytmos sells 1 one-off in-app purchase and O sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

O holds the better App Store score, 4.6 against 3.6. Both are backed by a comparable volume of ratings — 62 and 191 respectively. Written reviews point the same way: 48% of Rytmos's written reviews are positive against 72% of O's.

Rytmos ships an update every 2 months, O weekly. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Rytmos | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (62 ratings)](https://appshunter.io/ios/app/rytmos/id1673697954/reviews) | **[4.6 (191 ratings)](https://appshunter.io/ios/app/o-void/id6449623550/reviews)** |
| Number of ratings | 62 | **191** |
| Positive reviews | 47.7% of reviews | **72.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#168** | — |
| Size | 730 MB | 43 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Floppy Club](https://appshunter.io/developer/1673697956) | [Gearhead Games ApS](https://appshunter.io/developer/1163605497) |

## What reviewers say

### Rytmos

[App page](https://appshunter.io/ios/app/rytmos/id1673697954)

**Currently charting:** #168 Top Grossing · Music (US App Store)

Solve maze puzzles to create evolving musical compositions. Explore planets, discover new sounds, and unlock musical toys. This relaxing game also offers insights into music history.

**Highlights:** Maze puzzle gameplay, Music creation, Planet exploration, Unlockable musical toys, Music history facts, Expansion pack included

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock the galaxy | $4.99 | one-time |

**What reviewers like**

- ✨ Beautiful design and graphics
- 🎶 Engaging music and sound design
- 🧠 Interesting and addictive puzzles
- 💡 Informative about music history and instruments
- 😌 Relaxing and enjoyable gameplay

**What reviewers complain about**

- 💥 Frequent crashes and unresponsiveness
- ⚫ Black screen on launch
- 💰 Expensive for full version/expansions
- 🚫 Paywall after demo
- 📶 Requires internet connection

**Reported bugs**

- App crashes on startup
- Black screen on launch
- Game freezes during purchase process
- Purchases not syncing across devices
- No sound issues

**Requested features**

- Add multi-touch functionality for instruments
- Improve jam section responsiveness
- Allow viewing instrument history after unlock
- Port to VR
- Add more free levels or planets


### 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


## Frequently asked questions

### Is Rytmos free?

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

### Is O free?

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

### Which has better reviews, Rytmos or O?

O is rated higher. Rytmos averages 3.6 out of 5 from 62 ratings, while O averages 4.6 from 191 ratings.

### Do Rytmos or O have ads?

O shows ads; Rytmos does not.

### Which is updated more often, Rytmos or O?

Rytmos ships an update every 2 months, and O weekly. Most recently, Rytmos was updated on September 28, 2026 and O on September 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*