Loading page
About this tool
Measure and track your reaction time with interactive tests and progress tracking.
Reaction Speed Test measures how many milliseconds pass between the screen turning green and your click, then grades the result on a five-band scale from Elite (under 150 ms) to Keep Practicing (over 350 ms). Each round waits a random 2 to 5 seconds before the green signal, so you cannot anticipate it, and clicking early is caught and scored as Too Soon rather than counted. It keeps your last 10 attempts with a running best and average, which is the number worth watching — a single trial says very little about your true reflex speed.
Open Reaction Speed Test on AltFTool — it loads instantly in your browser.
Click the panel while it reads 'Click to Start'; it turns amber, shows 'Get Ready...' and holds for a random 2000 to 5000 ms.
Click the instant the panel turns green and reads 'CLICK NOW!' — clicking during the amber phase returns 'Too Soon!' and is discarded.
Your time appears in ms with its band from Elite (under 150 ms) to Keep Practicing (over 350 ms); Best, Average and Attempts cover your last 10 goes.
The green signal fires after an unpredictable 2000-5000 ms delay, so you cannot time the click by rhythm.
Clicking during the amber Get Ready phase returns Too Soon and the attempt is discarded instead of logged as a fast score.
Every attempt is labelled against a fixed five-band scale and stored alongside your best and rolling average of the last 10 tries.
Under 250 ms is above average and under 200 ms is genuinely quick. The scale here is Elite below 150 ms, Pro 150-200 ms, Above Average 200-250 ms, Average 250-350 ms, and above 350 ms flagged for practice. Most adults clicking a mouse land somewhere in the 200-300 ms range.
The delay is deliberately randomised between 2 and 5 seconds so you cannot learn the timing and click from memory. A fixed delay would measure your rhythm rather than your reaction.
You get a Too Soon screen and that attempt is not added to your history, so it cannot inflate your best or average. Click again to start a fresh round.
Use the average over all 10 stored attempts rather than any single score. Reaction times vary by tens of milliseconds trial to trial, so one fast click is noise; the average is the figure that actually moves when your alertness changes.