Conflict
Your brain plays a trick: the word says BLUE, but the ink is red! How fast can you choose the ink colour without following the word?
Score saved! Enter your name:
Scientific Test
The Stroop effect has been used in attention research since 1935.
Beat the Clock
Give as many correct answers as possible before time runs out and earn streak bonuses.
3 Challenge Modes
Test your cognitive flexibility in Classic, Reverse and rule-switching Mixed mode.
How to Play
A colour word appears, but its ink colour is often different from the word.
In Classic mode, ignore the word and tap the sphere that matches the ACTUAL INK COLOUR.
In Reverse mode, do the opposite: ignore the ink and choose the MEANING OF THE WORD.
In Mixed mode, the rule changes every question; watch the label above.
A correct answer earns +10 points; every correct answer in a streak of 3+ adds a +5 bonus. A mistake costs 5 points and resets the streak.
Save your score with your name at the end. Mode, duration, sound and dark mode are available in Settings.
Time’s Up! ⏱️
⚙ SETTINGS
Changing the mode or duration restarts the current round.
What Is the Stroop Test?
The Stroop test presents a colour word in an ink colour that may not match its meaning. If the word BLUE appears in red ink, the classic task is to choose red. Reading is so automatic that the word competes with the ink colour, creating a brief delay known as the Stroop effect.
This online version turns that conflict into a timed attention game. Classic mode asks for the ink colour, Reverse asks for the word meaning, and Mixed changes the rule from one question to the next. The result screen reports accuracy, streaks and reaction time. It is an exercise and entertainment tool, not a medical diagnosis.
How to Play
- A colour word appears in a coloured ink.
- In Classic mode, ignore the word and choose the sphere matching the ink colour.
- In Reverse mode, ignore the ink colour and choose the meaning of the word.
- In Mixed mode, read the rule label first because the task can switch every question.
- Correct answers add 10 points. A streak of 3 or more adds a 5-point bonus; a mistake removes 5 points and resets the streak.
- Answer as accurately as possible before the timer reaches zero, then review your reaction statistics.
How to Improve Your Score
- Do not try to stop reading. Instead, pause for a fraction of a second and direct the final decision to the relevant feature.
- Read the rule before the stimulus in Mixed mode. This prevents your brain from defaulting to the classic ink-colour task.
- Keep your pointer near the answer area. Shorter hand movement leaves more time for the actual decision.
- Slow down after an error. Rushing to recover often creates a chain of mistakes and destroys the streak bonus.
- Use congruent trials efficiently. When the word and ink match, answer quickly and save attention for conflicting trials.
- Compare like with like. Practise at a similar time of day and on the same device if you want a meaningful trend.
What Does It Train?
- Response inhibition: stopping an automatic but irrelevant answer is a core executive function.
- Selective attention: you focus on one feature of a stimulus while ignoring another.
- Cognitive flexibility: Mixed mode makes you switch quickly between two rules.
- Processing speed: the perceive, decide and respond cycle becomes more efficient with practice.
- Error awareness: immediate feedback helps you notice mistakes and adjust your pace.
Frequently Asked Questions
Is the Stroop test free?
Yes. This browser version is completely free and does not require an account.
Why does the Stroop effect happen?
Reading becomes highly automatic, so a conflicting word competes with the ink-colour response and slows the decision.
What is a good reaction time?
An average below 800 ms on incongruent trials is a strong result, although devices and testing conditions can affect timing.
Which skills does it train?
It exercises selective attention, response inhibition, cognitive flexibility and quick decisions under interference.
Can I learn not to read the word?
Not usually. Skilled adult reading is automatic; practice helps you suppress the word response before it becomes your answer.
Which mode is hardest?
Mixed mode is usually hardest because the rule switches between ink colour and word meaning from one question to the next.
Why does my score change?
Sleep, fatigue, distraction, screen size and input method can all change attention and reaction time. Compare sessions under similar conditions.
Is this a clinical Stroop test?
It uses the Stroop principle, but this version is designed for entertainment and practice. It is not a diagnostic assessment.
Ready to Test Your Focus?
Start above, follow the rule and choose the colours before time runs out — no registration, completely free.
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