# Brain Training vs O

The clearest difference is in-app purchases: Brain Training at none against O's 1. O's advantage is update cadence (weekly vs every 2 months) and review sentiment (72% vs 52%). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.6 for Brain Training against 4.6 for O. Both are backed by a comparable volume of ratings — 92 and 191 respectively. Written reviews are what separate them: 52% of Brain Training's written reviews are positive against 72% of O's.

Brain Training ships an update every 2 months, O weekly. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Brain Training | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (92 ratings)](https://appshunter.io/ios/app/brain-training-quick-reaction/id1542572722/reviews) | [4.6 (191 ratings)](https://appshunter.io/ios/app/o-void/id6449623550/reviews) |
| Number of ratings | 92 | **191** |
| Positive reviews | 51.5% of reviews | **72.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Best chart rank | — | **#157** |
| Size | 146 MB | 43 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [THOMSON Inc.](https://appshunter.io/developer/492371813) | [Gearhead Games ApS](https://appshunter.io/developer/1163605497) |

## What reviewers say

### Brain Training

[App page](https://appshunter.io/ios/app/brain-training-quick-reaction/id1542572722)

This game offers fast-paced training to enhance reaction time, reflexes, and brain speed. It features simple, intuitive gameplay where players tap targets as quickly and accurately as possible to improve their performance.

**Highlights:** Improve reaction speed and reflexes, Sharpen brain processing speed, Simple and intuitive gameplay, Speed test style challenges, 20 progressive stages, Track performance and beat scores

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

**In-app purchases:** none


### O

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

**Currently charting:** #157 Top Grossing · Music (US App Store)

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 Brain Training free?

Brain Training is free to download, with no in-app purchases.

### Is O free?

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

### Which has better reviews, Brain Training or O?

Brain Training and O are both rated 4.6 out of 5 on the App Store, from 92 and 191 ratings respectively.

### Do Brain Training or O have ads?

Both Brain Training and O show ads.

### Which is updated more often, Brain Training or O?

Brain Training ships an update every 2 months, and O weekly. Most recently, Brain Training was updated on October 12, 2026 and O on October 13, 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.*