Senzu
The most precise reaction time app to track your improvement and compete with others
Try it out
Click to Start
Test your reaction time
💡 Average human reaction time: 250ms
Track Your Progress
Precise Measurements
High-precision timing with sub-millisecond accuracy
Global Leaderboards
Compete with players worldwide and track rankings
Detailed Analytics
Track improvement over time with comprehensive stats
Sample Progress
Week 1 Average285ms
Week 4 Average215ms
+25% improvement in just 4 weeks!