Stroop Test
A colour word appears, printed in a colour that often does not match. Your job is to name the ink colour, not read the word. This free Stroop test measures how well you push past conflicting information, reporting your reaction time and accuracy. It is a classic attention exercise, run entirely in your browser with no sign-up.
Take the Stroop test and see how well you handle conflicting information. A colour word shows up printed in a different ink colour, and you name the ink, not the word, which is the classic Stroop effect. This Stroop colour and word test reports your reaction time and accuracy so you can measure your attention and processing speed. People run it as a focus test, a concentration check, or a quick psychology demo of how reading interferes with naming.
- No sign-up, ever
- 100% free
- Nothing uploaded
- Works offline after first load
- Scores stay on your device
How to use it
- 1
Read the rule
You answer with the colour the word is printed in, ignoring what the word says.
- 2
Answer quickly
Tap or click the matching colour as fast as you can across a run of words.
- 3
See the conflict cost
Your result shows your speed and accuracy, and how much the mismatched words slowed you down.
When it comes in handy
Attention check
See how well you hold a rule in mind when your instinct pulls the other way.
Focus warm-up
Use it as a quick mental warm-up before work that needs concentration.
Psychology demos
Show the Stroop effect in a classroom or to friends in under a minute.
Instant & 100% private — nothing is uploaded
Every game runs right here in your browser, and your best scores are kept on your own device. Nothing is sent to a server, so there is no sign-up and no account. Load the page once and it keeps working even if you go offline.
Frequently asked questions
- What is the Stroop effect?
- It is the way reading gets in the way of naming. Because reading is automatic for fluent readers, a word like "red" printed in blue creates a small conflict your brain has to override, which makes you slower and more error-prone than when the word and colour agree. Studies typically find the mismatched words add roughly 100 to 200 milliseconds per answer.
- What counts as a good result?
- High accuracy with a steady speed is the goal. Most people are noticeably slower on the mismatched words than the matching ones, and a smaller gap between the two suggests stronger attention control. Compare your own runs rather than chasing a fixed target.
- Is this a medical or diagnostic test?
- No. This is a fun, informational take on the classic Stroop colour-word task used in psychology labs. It measures how a mismatch between a word and its ink colour slows you down, but it is not a clinical assessment and should not be used to diagnose anything.
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