Measure your reaction speed with color, direction, or random choice tests on desktop, phone, or tablet.
Five attempts. Your average and fastest result will be shown.
Shared leaderboard. Scores are posted only after you enter a nickname.
In Color mode, wait through the red screen, then click once or press Space when it turns green. In Direction mode, choose the shown arrow from four directions. Random mode chooses a color or direction signal for each attempt. Your average and fastest result across five attempts are shown. An early response cancels the run.
On desktop, use Space or one click for a color signal, and arrow keys or one of four buttons for a direction signal. On mobile, tap the color signal once or choose the shown direction. Random mode uses the input that matches the signal. Choose manual or automatic progress between attempts.
The result measures the time from seeing the visual signal to your input. Display refresh rate, device performance, and mouse or touch latency can affect it, so scores from different devices are not directly comparable.