🎨 Classic
Name ink colors while ignoring text meaning.
Free Cognitive Assessment · No Signup
The Stroop Test — Online & Free
Measure cognitive interference, selective attention, and response inhibition. Configure settings and get instant scoring.
Interactive Test
Classic, mixed, number and emotional modes with keyboard-friendly controls.
Advanced Settings
Play the Stroop Test Now
How to Play
- Goal: Click the button that matches the COLOR of the displayed word.
- Challenge: Ignore the word's meaning, focus only on the display color.
- Time: One total countdown for the entire test session.
- Scoring: Based on accuracy and reaction time.
- Example: When you see the word "Red" displayed in blue color, click the Blue button.
Time Left
60Score
0Accuracy
0%Black
Click the button that matches the COLOR of the displayed word, not the word itself!
Test Complete!
Performance Index i
—Total Score
—Question Rate i
—Accuracy Rate i
—Avg Response Time i
—Total Questions
—Correct Answers
—Wrong Answers
—Test Modes
📖 Word Reading
Read words for baseline processing speed.
🔀 Mixed
Switch between color and word tasks.
🔢 Number
Count digits against conflicting symbols.
💬 Emotional
Color-name emotionally loaded words.
What Is the Stroop Test?
The Stroop Test was introduced in 1935 and remains a core paradigm in cognitive psychology. It measures how strongly automatic reading interferes with the slower task of naming ink colors.
A lower interference score usually indicates stronger cognitive control. You can repeat sessions and compare your trend over time.
Score Interpretation
The most important metric is the interference score: incongruent reaction time minus congruent reaction time. Lower interference usually means stronger response inhibition and better attentional control.
| Metric | What It Means | Typical Range |
|---|---|---|
| Accuracy | Correct answers across trials | 85-98% |
| Avg RT | Reaction speed on correct answers | 600-1200ms |
| Interference | Incongruent RT - Congruent RT | +100 to +300ms |
Frequently Asked Questions
What does the Stroop Test measure?
It measures cognitive interference, selective attention, inhibitory control, and executive function.
What is a good Stroop score?
Interference under 80ms is excellent, 80-150ms is good, and 150-300ms is common in general populations.
How long does the test take?
A 20-trial online session usually takes 2-5 minutes, while longer research protocols can take 10+ minutes.
Quick Score Guide
Accuracy
Target 90%+ with stable timing.
Average RT
Most users fall around 600–1100ms.
Interference
Incongruent RT minus congruent RT; lower is better.
Consistency
Repeat sessions to observe trends over days.