Reaction: Press and Hold

Reaction measures the moment you LIFT your finger, not when you tap. By removing the travel time of moving your finger to the screen, it gets closer to your pure reaction time. Features - Hold, then release the instant the signal appears. Release-time measurement - Frame-accurate timing to minimize display latency - Anticipation guard. Releases faster than humanly possible are rejected - Per-session average, best, and consistency (standard deviation) - Trend chart and your personal reaction-time distribution - Export your results to CSV - Everything stays on device. No data collection, tracking, or ads - Works on iPhone, iPad, and Mac A note on accuracy Any software-based tester has a small, unavoidable delay (typically under one frame) from the display pipeline. Treat results as a consistent way to track your own trend over time, not as a lab-grade absolute measurement.