Comparison

Brain Training vs O

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Brain Training

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
Read full description

Free. No registration. Just tap and train your reaction speed. Brain Training: Quick Reaction is a fast-paced reaction training game that helps improve reaction time, reflexes, and brain speed through simple and fun gameplay. Tap the targets as quickly and accurately as possible. Easy to play, but challenging to master. WHY YOU'LL LOVE THIS GAME: • Fast and fun reaction training • Simple and intuitive gameplay • Speed test style challenges • Clear sense of improvement TRAIN YOUR REACTION TIME: • Improve reaction speed and reflexes • Sharpen brain processing speed • Perfect for short training sessions HOW TO PLAY: • Tap randomly appearing targets • Tap only the number shown on the target • Wrong taps or zero reduce your score TRACK YOUR PERFORMANCE: • Test your reaction speed • Beat your best score • Improve aim and accuracy PROGRESSIVE STAGES: • 20 stages from beginner to advanced • Increasing difficulty • Sci-fi inspired world RECOMMENDED FOR: • Reaction and reflex game fans • Players who want to improve reaction time • Athletes training quick responses • FPS and action game players • Anyone looking for a simple brain training game Train the flow of vision to brain to action. React faster with every play. Unlock your full reaction potential.

About

O

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
Currently charting
Read full description

Jump into the spinning circle of O-VOID! In this super minimal action runner, you’ll be jumping over obstacles with the tap of a finger. But this is not a regular platformer! The entire level can change direction or flip upside down to throw you off. Are you skilled enough to survive every challenge? Features: • Simple one-tap gameplay inside mind-bending geometry • 7 randomly generated levels for endless replayability • Unique and pumping chiptune soundtrack • Near impossible challenges to unlock player customizations • Global leaderboards to compete with the world on

Screenshots

Brain Training4 screens
O4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 5 level
Brain Training versus O: the parameters behind the verdict, then further details
ParameterBrain TrainingO
PriceFreeFree
Rating4.6 (92 ratings)4.6 (191 ratings)
Positive reviews51.5% of reviews72.4% of reviews — better
Number of ratings92191 — better
Update frequencyEvery 2 monthsWeekly — better
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
Best chart rank—#157 — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.013.0 — better
Further details — not scored
Size146 MB43 MB
Age rating4+4+
DeveloperTHOMSON Inc.Gearhead Games ApS

Customer experience

Brain Training

All ratings92 ratings
Positive89.1%
Neutral8.7%
Negative2.2%
Written reviews33 reviews
Positive51.5%
Neutral12.1%
Negative36.4%

O

All ratings191 ratings
Positive90.6%
Neutral3.1%
Negative6.3%
Written reviews58 reviews
Positive72.4%
Neutral10.3%
Negative17.2%

Bugs and requests

Brain Training

Not enough reviews yet to summarise bugs or requests.

O

Reported bugs

9 issues
  • 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
Show 4 more
  • Ads during gameplay cause freezes
  • Level 6 is impossible
  • Ads are annoying and unsolicited
  • Forced ads when choosing to restart

Requested features

6 requests
  • Add more levels
  • New dimension/different gameplay principle
  • User level creator
  • More beats/music synchronization
  • Option to turn down color brightness
Show 1 more
  • More publicity for leaderboards

In-app purchases

None

Brain Training

No in-app purchases

1 purchases

O

One-time1
  • No Ads$2.99

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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