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Color–Word Clash – Stroop Test
A colour word appears in a colour of ink. Answer the ink, not the word: BLUE written in orange ink is “orange”. Your brain reads the word without being asked, and holding that back is the skill this trains.
Answer the ink colour, not the word.
You have seconds. Use the buttons or keys 1–4.
Time’s up!
Correct answers a minute
Score /100 · accuracy
Clash cost: How much slower you were when the word and ink didn’t match ( vs ms). Smaller is better.
New personal best!
More focus games
These are practice games for training and tracking your own focus, based on well-known attention and memory tasks. They are not medical or psychological tests and can’t diagnose anything, such as ADHD. If you are worried about your attention or memory, talk to a doctor.
About the Stroop Test
The Stroop test shows a colour word, such as BLUE, printed in a colour of ink, such as orange. Your job is to answer the ink colour and ignore the word. Because reading is automatic, the word gets in the way, and you are slower when the two clash. Here it is called Color–Word Clash: a 60-second round with about half matching and half clashing words. You get correct answers per minute, accuracy, and your clash cost: how many milliseconds slower you were on clashing words. The four inks are picked to stay distinct for the common kinds of colour blindness, and every button shows the colour’s name too.
How to use it
- 1 Press Start. A word appears in a coloured ink.
- 2 Tap the button for the ink colour (or press 1 to 4). Ignore what the word says.
- 3 Keep going for 60 seconds. Each answer brings the next word.
- 4 See your answers per minute, accuracy and clash cost.
Frequently asked questions
What is the Stroop effect?
The slow-down you feel when a word and its ink colour don’t match, first described by John Ridley Stroop in 1935. Reading the word happens without effort, so naming the ink means holding the word back, which takes time.
What is a good Stroop score?
Most people answer about 40 to 55 correctly a minute with buttons, with a clash cost of 50 to 150 ms. A smaller clash cost means you are better at ignoring the word.
What is the clash cost?
Your average time on clashing words minus your average time on matching words, for correct answers only. Psychologists call it the interference effect.
I am colour blind. Can I play?
The four inks (blue, orange, green and pink) come from a palette designed to stay distinct for the common kinds of colour blindness, and each button shows the name as well as the colour. If two inks still look alike to you, the scores won’t mean much, sadly.
Does it help to play every day?
Your scores will improve with practice, and the clash cost usually shrinks. Treat it as practice at ignoring distractions and as a daily check of how sharp you feel.
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