Reaction time

Focus the panel, then click, tap or press Space or Enter to begin. Wait for the green “Go!” signal in Visual mode, or the tone in Sound mode, and respond once. Choose a pitch and use Check sound to set a comfortable volume before a sound trial. Pitch is fixed during each trial and recorded with your result. The panel stays still when the tone plays. An early response doesn’t count. Escape resets the current trial and keeps your completed results; Start over clears only the selected mode’s session. Switching modes keeps their results separate. Leaving the tab or changing focus cancels an unfinished trial.

Your time is the delay between the visual signal or scheduled tone and your response. Lower numbers mean a quicker response in this session. Average and best include only completed trials. Screen refresh rate, browser activity, audio output and input-device delay all affect the result. Bluetooth audio can add a noticeable delay, so compare attempts using the same device and input method. Compare each mode separately. Screen-reader announcements introduce their own delay; Sound mode requires hearing the tone.

Results stay in this page session and disappear when you reload or leave. After five trials, you can download a copy to keep.