Easy Mode
A shorter introduction using the classic four-color set.
30 seconds
12 questions · 4 colors
Free online tool
Stroop Test Online
Choose easy, standard, or challenge mode and measure your accuracy, reaction time, and color-word interference.
Standard Mode
The original 24-question test, recommended for most people.
1 minute
24 questions · 4 colors
Challenge Mode
An extended six-color test for a more demanding challenge.
3 minutes
72 questions · 6 colors
How to play
Select the color of the text, not the word itself.
Choose the button that matches the ink. In the example, the word says BLUE, but the ink is red, so the correct answer is RED. Each question has a 10-second limit in every mode.
3 modes4–6 colorsNo sign-up required
Example
BLUE