Stroop Test Online: Free Color-Word Focus Test
The Stroop test is a gold-standard measure of selective attention and mental control: you name the color the word is printed in, while ignoring what the word says. Take the Stroop test online for free and get an instant score for accuracy and speed. No sign-up required.
A quiet round of Stroop Test — Standard. When you start, everything else fades — just you and the task.
No sign-up needed. Press Esc to exit anytime.
Tip
Let the word stay slightly blurred. Reading fires automatically once the letters resolve into a word. Softening your gaze — looking through the text rather than at it — leaves the ink color perfectly visible while the word itself never quite finishes arriving.
Everything here is free
Every test, every difficulty, no limit and no account. If it is useful to you, you can chip in — entirely optional, and nothing changes either way.
How to play
- A colored word appears — for example, the word BLUE printed in red ink.
- Press 1–4 for the INK color, not the word itself — or tap the buttons.
- Go as fast as you can while keeping your answers accurate.
- Finish all trials to see your accuracy, speed, and score.
Stroop Test tips
Ways to play it better — each one comes from how this version actually scores, not from general advice about concentration.
Let the word stay slightly blurred
Reading fires automatically once the letters resolve into a word. Softening your gaze — looking through the text rather than at it — leaves the ink color perfectly visible while the word itself never quite finishes arriving.
Don't name the color in your head
Saying the color name to yourself puts the answer back into the same verbal channel the printed word already occupies, which is exactly where the conflict lives. Going straight from what you see to which button you press skips the collision.
Accuracy is worth far more than pace here
This test weights accuracy heavily and speed lightly, the opposite of the scanning tests — control is the thing being measured, so there is no prize for racing. On a trial that feels wrong, an extra beat is almost always the cheaper option.
One caveat worth knowing: a change of strategy moves your score for reasons that have nothing to do with attention. Your dashboard reads each session against your own recent ones, so if you adopt something from this list, give it a few sessions before reading anything into the trend.
Frequently asked questions
What does the Stroop test measure?+
It measures selective attention and cognitive control — your ability to focus on one feature (the ink color) while suppressing an automatic response (reading the word).
Why is the Stroop test hard?+
Reading is automatic, so when the word and the ink color disagree, your brain has to actively inhibit the reading response. That conflict is exactly what the test measures.
Do I need to sign up to take the Stroop test?+
No — play and see your score for free. An account only adds saving your history and the leaderboard.
Is the Stroop test the same as an IQ test?+
No. The Stroop test measures one specific thing — selective attention and interference control — not general intelligence. It's a focus-training exercise, not a clinical or diagnostic assessment.
Teaching with this
- Stroop Effect Lesson Plan — a 45-minute class, free to reuse under CC BY. Runs on paper if the devices fail.
Where this fits
- Attention Span Test — Selective attention under interference. Reading is automatic, so naming the ink color means actively suppressing the word — the classic demonstration that attention is effortful.
Try another challenge
Holding a rule under pressure — closest to this one
Finding things fast
Schulte Table · Visual Search · Cancellation Task · Trail Making Test
Staying with it
Sustained Attention to Response Task · Mackworth Clock Test · Psychomotor Vigilance Task
Keeping up with change
Multiple Object Tracking · Change Blindness Test · Task Switching Test