Stroop Test
Answer the ink colour, not the word. Sixty seconds of holding back what your brain wants to say.
Play now →What is the Stroop effect?
When the word "RED" is printed in blue ink, your brain reads the word before it registers the colour — and answering "blue" takes noticeably longer than it should.
That slowdown, when meaning and colour conflict, is the Stroop effect, first described by the psychologist John Ridley Stroop in 1935. It is one of the most reproduced findings in cognitive psychology.
The test measures how well you can override that automatic reading response — what psychologists call inhibitory control — along with sustained attention.
How to play
- A colour word appears on screen, printed in a different colour.
- Tap the button for the colour the word is printed in, not the colour it names.
- Score as many as you can in sixty seconds. Wrong answers cost you time, so stay calm and look only at the colour.
Tip: narrow your eyes slightly and treat the word as a block of colour rather than something to read — most people get noticeably faster.
Why play here
- No sign-up, no install — open the link and you are playing in three seconds.
- Sixty-second time attack — short and intense, with your best kept on your device.
- Built for phones — large buttons that are comfortable to hit at speed.
Why naming a colour is the slower job
For anyone who reads fluently, reading is automatic. The meaning of a word arrives whether you want it or not. Naming a colour has never been practised to that degree, so it stays a deliberate act every single time.
When the word RED is printed in blue ink, the fast answer red and the slower answer blue collide at the moment you choose a response. The time it takes to override the first one is exactly the slowdown this test measures. The gap between matching trials and conflicting trials is the number that matters.
Four ways to score higher
- Do not look straight at the word. Resting your gaze slightly off-centre keeps the letterforms from resolving sharply, so reading intrudes less. Narrowing your eyes works for the same reason.
- Let your hand learn the buttons. If you have to hunt for the right button after deciding, you pay twice. Go deliberately slowly for the first few seconds to fix the positions.
- Keep a rhythm rather than racing. Wrong answers cost you time, so a steady run of correct ones beats a burst followed by a miss.
- Watch the trial right after an error. People rush to make up the loss and miss again. Take the next one deliberately half a beat slower.
How to read your score
The Stroop task has a long history in psychology, but what you get here is a game score, not an assessment. Screen size, lighting, how far your thumb travels and how tired you are all move it around.
So compare your runs against your own, taken on the same device, rather than against anyone else. A few rounds at a similar time of day will tell you where you actually sit.
Frequently asked questions
- Is it really free?
- Yes. Every game is free and no account is needed.
- What exactly am I answering?
- The ink colour the word is printed in, never the colour the word spells out.
- Are there other focus games?
- Yes — the reaction time test, memory games, the IQ test and more than thirty others.