Reaction Time Test
Train simple visual choice reaction time: random pre-cue delay, green go-signal, optional beep, and deep session stats. For fun and self-comparison — not a clinical measure.
Tap or press Space / Enter to start
Complete trials to see a sparkline.
Balanced random delay; closest to common online tests.
Short tone when the go-signal appears.
Instant color transitions.
Lower spread usually means less guessing and steadier focus.
Trade speed for discipline — patience beats anticipation.
No completed trials yet.
This page measures end-to-end latency: from the moment the browser paints green until your input is processed. That includes monitor/phone panel lag, browser compositing, Bluetooth mice, and touch digitizers.
Lab reaction times (often quoted around 150–300 ms) usually use controlled hardware and sometimes simpler stimuli. Treat cross-device numbers as "different tracks", not rivals.
- Rest your dominant finger on the key or screen edge — minimize travel distance.
- Relax muscles during the wait; tension often triggers false starts.
- Use the same difficulty for a block of trials before changing settings.
- Try Intense only after you rarely false-start.