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Play now →Stroop Test
A 30-second psychology classic. A color word appears — RED, GREEN, BLUE… — but the ink is a different color. Your job: pick the ink color, not what the word says. Sounds easy until your reading reflex fights back.
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Pick the INK color of the word — not what it says.
Keyboard shortcuts: 1–4 pick the four answers.
How to play
- Press Start — you get 30 seconds.
- A color word appears in a mismatching ink color.
- Click (or press 1–4 for) the color NAME that matches the INK, ignoring the word itself.
- Correct answers build your score; wrong answers are counted against you.
Frequently asked questions
What is the Stroop effect?
The Stroop effect is a psychology classic: when a word like RED is printed in green ink, reading the word is automatic and interferes with naming the ink color. The delay and errors this creates measure how strong that interference is.
What am I actually testing here?
Selective attention and cognitive inhibition — your brain’s ability to suppress the automatic impulse (reading the word) in favour of the rule-driven response (naming the ink color). It is one of the most validated attention measures in psychology.
What is a good Stroop test score?
In a 30-second round, most people correctly answer 14–20 items. Around 20–27 is above average, and 27+ means your inhibition is genuinely sharp. Accuracy matters: wrong answers are counted too, so wild clicking is not a strategy.
Why is it harder to name the ink color?
Reading is so over-learned that it runs automatically, while naming a color is a deliberate choice. The Stroop task pits these two systems against each other, and the slower one — deliberate naming — pays the interference tax.
Can practising the Stroop test improve my focus?
You will definitely get better at the task itself, and some studies link inhibition training to small gains in attention control. Treat it like a gym set for your focus: regular short sessions beat one long marathon.