Stroop Effect Test
A classic psychology test to measure your brain's processing speed and selective attention.
How to Play
You will see a series of color names (Red, Green, Blue, etc.) displayed on the screen.
Your goal is to click the button that matches the COLOR the word is printed in, NOT the word itself.
You have 30 seconds to get as many correct as possible. Incorrect answers will subtract from your score.
LOADING
Time's Up!
Let's see how your brain handled the interference.
The Stroop Test: Can Your Brain Keep Up?
Words like RED appear printed in a different ink color — your job is to name the color of the ink, not read the word. This classic psychology experiment tests your cognitive flexibility and reaction speed.
Play timed rounds in your browser, track your accuracy and average reaction time, and challenge yourself to beat your best score. No account needed.
Classic psychology experiment
The real Stroop task used in cognitive science since 1935 — now as a fast, playable browser game.
Speed and accuracy tracking
Each round measures how fast and how accurately you respond, so you can watch your focus improve with practice.
Free brain game
A fun way to test mental flexibility and attention. Play a quick round whenever you want a cognitive warm-up.
How to use
- Click Start Game.
- Name the INK COLOR of each word shown — ignore what the word says.
- Answer as fast as you can through the round.
- See your score, accuracy and reaction stats.
Frequently Asked Questions
What is the Stroop effect?
The delay in reaction time when a word's meaning conflicts with its ink color — your brain wants to read the word instead of naming the color.
How do I play?
Look at each word and select or say the color of the ink it is printed in, ignoring the word's meaning. Speed and accuracy both count.
What does my score mean?
Faster, more accurate responses suggest stronger selective attention and cognitive flexibility. Slower responses on mismatched words are the classic Stroop effect in action.
Is it a medical test?
No — this is a fun demonstration of the Stroop effect, not a clinical or diagnostic assessment.
Is the game free?
Yes, free with no signup.
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