Comparison

Quick Calculation Quiz vs One Brain

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

Head to head
About

Quick Calculation Quiz

Test your math skills in a timed challenge. Solve equations quickly to achieve a high score and compete with friends. It's a fun way to train your brain with both easy and challenging problems.

Highlights
  • Timed math problem solving
  • High score tracking
  • Multiplayer comparison
  • Brain training exercises
  • No calculator required
Features
Read full description

In this game you have 100 seconds to solve as many math problems (equations) as possible. Achieve a new high score, try to beat other players and your friends. Download now for free! A game always consists of both very easy and some slightly more difficult math problems. However, you should be able to solve all equations without a calculator. You will see the first math problem as soon as you tap the "Start" button. Your time begins to count down. Use the numeric keypad to type your answer and tap the enter button. The game is over either if your time is up, or as soon as you give a wrong answer. With each correct answer 1 point will be added to your score. Try to achieve a new highscore each time you play the game. Use the game center to compare your highscore with other players or your friends. Train your brain while playing the game and try to beat your own highscore, other players or your friends. This mathematics trainer is the perfect mental exercise. Try to achieve a new highscore now. Download and play for free! Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

One Brain

Test your cognitive abilities with a game inspired by the Stroop effect. Quickly identify matching colors, arrow directions, or true/false math equations under time pressure. Challenge your brain to process conflicting information and achieve high scores.

Highlights
  • Stroop effect inspired gameplay
  • Color matching challenges
  • Arrow direction tests
  • Math equation verification
  • Timed gameplay
  • Score tracking
Features
Read full description

One Brain is inspired by the Stroop effect, a famous psychological test that measures how well you handle conflicting information. For example, it's harder to name the color of a word when the word itself spells a different color. This game challenges your whole brain as you fight to process the mixed signals and make the right call before time runs out. Game modes: • Colors: Does the word match the color it's written in? • Arrows: Is the arrow actually pointing the way it says it is? • Numbers: Is the math equation true or false? • Words: Which word matches the definition? How high can you score under pressure?

Screenshots

Quick Calculation Quiz4 screens
One Brain4 screens

Verdict

The call

The clearest difference is update cadence: One Brain at weekly against Quick Calculation Quiz's every 10 months. Quick Calculation Quiz's advantage is review sentiment (87% vs 59%). 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. Quick Calculation Quiz sells 5 in-app purchases, starting at $2.99 per month and One Brain sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Quick Calculation Quiz holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 208 and 297 respectively. Written reviews point the same way: 87% of Quick Calculation Quiz's written reviews are positive against 59% of One Brain's.

UpkeepUpdate frequency

Quick Calculation Quiz ships an update every 10 months, One Brain weekly. Both last shipped on September 24, 2026.

Scorecard2 real differences · 8 level
Quick Calculation Quiz versus One Brain: the parameters behind the verdict, then further details
ParameterQuick Calculation QuizOne Brain
PriceFreeFree
Rating4.6 (208 ratings) — better4.4 (297 ratings)
Positive reviews86.8% of reviews — better58.6% of reviews
Number of ratings208297 — better
Update frequencyEvery 10 monthsWeekly — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.215 — better
Further details — not scored
Size6 MB10 MB
Age rating4++4
DeveloperBrachmann Online Marketing GmbH & Co. KGErik Wegener

Customer experience

Quick Calculation Quiz

All ratings208 ratings
Positive90.4%
Neutral5.8%
Negative3.8%
Written reviews91 reviews
Positive86.8%
Neutral7.7%
Negative5.5%

One Brain

All ratings297 ratings
Positive82.8%
Neutral7.4%
Negative9.8%
Written reviews227 reviews
Positive58.6%
Neutral8.8%
Negative32.6%

User reviews

Quick Calculation Quiz

From 208 App Store ratings

What we love

  • 🧠 Effective mental math training
  • 👍 Simple and user-friendly interface
  • ⚡ Good difficulty progression for various skill levels
  • 🎮 Engaging and fun gameplay
  • 💰 Free to use with optional ad-free upgrade

Room to improve

  • 🐛 Submit button is too small and difficult to click
  • 🔤 Number pad layout is confusing and unintuitive
  • ⏰ Time pressure can be frustrating for some users
  • 🔁 Limited variety - repetitive problem types
  • 📺 Too many advertisements

One Brain

From 297 App Store ratings

What we love

  • 👍 Simple and effective brain training
  • 🧠 Helps improve focus and concentration
  • 🤯 Challenging and addictive gameplay

Room to improve

  • ⏱️ Timer is too short, needs more time
  • 🙄 Excessive ads and interruptions
  • 🤖 Inconsistent scoring and feedback

Bugs and requests

Quick Calculation Quiz

Reported bugs

3 issues
  • Submit button click detection is unreliable
  • Scoring system not calculating all correct answers properly
  • Screen touch responsiveness issues on smaller devices

Requested features

10 requests
  • Ability to select specific calculation types (addition, subtraction, multiplication, division)
  • Multiple difficulty levels or stages
  • Timed vs untimed game modes
  • Direct multiplayer/duel mode between two players
  • Voice input option for answers
Show 5 more
  • Larger submit button
  • Ranking system showing user's position on leaderboard
  • More varied content and game modes
  • Adjustable time limits
  • Separate sections for different operation types

One Brain

Reported bugs

3 issues
  • Incorrect registering of correct answers
  • Crashes and freezes on certain devices
  • Keyboard controls not working as expected

Requested features

3 requests
  • Adjustable difficulty levels
  • More game modes and variations
  • Option to disable ads or pay for ad-free version

In-app purchases

5 purchases

Quick Calculation Quiz

Subscriptions1
  • Premium$2.991 Month
One-time4
  • Voluntary Payment 1$0.99
  • Voluntary Payment 2$2.99
  • Voluntary Payment 3$9.99
Show 1 more
  • Remove Ads$12.99
1 purchases

One Brain

One-time1
  • Remove Ads$0.99

Questions

Is Quick Calculation Quiz free?
Quick Calculation Quiz is free to download, with in-app purchases available.
Is One Brain free?
One Brain is free to download, with in-app purchases available.
Which has better reviews, Quick Calculation Quiz or One Brain?
Quick Calculation Quiz is rated higher. Quick Calculation Quiz averages 4.6 out of 5 from 208 ratings, while One Brain averages 4.4 from 297 ratings.
Do Quick Calculation Quiz or One Brain have ads?
Both Quick Calculation Quiz and One Brain show ads.
Which is updated more often, Quick Calculation Quiz or One Brain?
Quick Calculation Quiz ships an update every 10 months, and One Brain weekly. Most recently, Quick Calculation Quiz was updated on September 24, 2026 and One Brain on September 24, 2026.

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