🎨 Stroop Test
Click the colour of the ink, not what the word says. 20 questions. Your brain will try to trick itself.
Stroop Test
The word says one colour. The ink is a different colour. Click the INK colour, not what it says. 20 rounds, timed.
Click the ink colour
How the Stroop Test Works
A colour word is displayed on screen in a different ink colour. Your task is to click the colour of the INK, not the word that is written. For example, if the word "RED" is printed in blue ink, the correct answer is blue. This conflict between what you read and what you see is what makes the test difficult.
The test runs for 20 questions. Your average response time per question is your score. The test also records your accuracy. Most people find their speed drops significantly compared to naming ink colours that match their word, which is the core finding of the original 1935 experiment by John Ridley Stroop.
What Your Score Means
An average response time under 1 second per question is sharp. Between 1 and 1.3 seconds is normal. Above 1.5 seconds indicates significant cognitive interference, which is very common on first attempts and one of the reasons this test tends to surprise people who expected it to be easy.
The Stroop effect is a measure of cognitive flexibility and selective attention. People with stronger working memory, regular meditators, and younger adults typically show smaller interference effects. This test is used clinically to screen for attention disorders and assess executive function, but this free version is not a diagnostic tool.
Tips to Perform Better
Deliberate practice on this test does produce improvement. The interference effect shrinks as your brain learns to suppress the automatic reading response in this specific context. Focusing on the physical colour of the letters rather than the meaning of the word is easier said than done, but with repetition the suppression becomes faster.
Mindfulness practice more generally strengthens the selective attention involved in the Stroop task. Ten minutes of daily focused attention training, sitting quietly and directing attention to one thing while resisting distraction, transfers measurably to Stroop performance over four to eight weeks.
Frequently Asked Questions
What is the Stroop effect?
The Stroop effect is the delay in response when the ink colour of a word conflicts with the word's meaning. First described by John Ridley Stroop in 1935, it is one of the most replicated findings in all of cognitive psychology. The effect demonstrates that reading is automatic and difficult to suppress.
Why is it so much harder than it looks?
Reading is automatic for literate adults. Your brain begins processing the word's meaning before you consciously decide to. Overriding this automatic response to name the ink colour instead requires deliberate effort and slows your reaction time by 100 to 300ms on average.
Is a slow Stroop score a sign of attention problems?
Not on its own. High interference on this test is normal, especially on first attempts. Clinical diagnosis of attention disorders requires a full professional assessment using multiple validated measures. This test is for curiosity and cognitive benchmarking only. Consult a professional if you have health concerns.
Can you get better at the Stroop test with practice?
Yes. The interference effect decreases with practice on the specific task. Scores typically improve by 0.1 to 0.3 seconds per question over several weeks of regular practice. This improvement is largely task-specific rather than a general improvement in attention.