ReflexLab began as one reaction time test, built for gaming and sport, where a tenth of a second decides the duel. It has grown into a set of tests, and each one keeps a record of every attempt so you can tell a real gain from a good day.
What You Can Measure
Every test gives you one number to chase and stores the settings you set it under.
- Reaction Time Test: Measure your visual reaction speed in milliseconds.
- Clicks Per Second Test: Measure how fast you can click, in clicks per second.
- Kohi Click Test: The classic fixed 10-second click test. Get your CPS and rank.
- Right Click CPS Test: Measure how fast you can right click, in clicks per second.
- Spacebar Speed Test: Measure how fast you can press the spacebar, in presses per second.
- Visual Memory Test: Memorise the pattern and recall it. How many tiles can you hold?
The click tests share one rank table on purpose. Eight clicks per second means the same thing whether you hit it on the timed CPS test, the ten-second Kohi format, or with your right mouse button.
What Happens After a Run
Finish a run and the panel under the test shows your personal best, your session average, a trend graph, and a timestamped history of recent attempts. Ranks climb from Beginner to Elite. Clear a tier once and it stays ticked on your checklist, even if the next ten runs fall short of it.
The visual memory test uses milestones instead of ranks. A level number does not band into tiers that mean anything, so it marks checkpoints you either reached or have not reached yet.
Hitting Reset clears a test's best, history, and ranks. Your settings survive it, so you do not have to rebuild them to start over.
Honest Measurement
A reaction test is worth no more than its clock. ReflexLab stamps the time withperformance.now() at the instant the target flips, stamps it again inside your input handler, and does nothing in between that could add delay.
Your monitor, your mouse, and your browser still add a few milliseconds on top. Compare your score against your own history rather than against a laboratory. The reaction test also runs five rounds by default and scores the average, so a single lucky click never sets your personal best.
Private by Default
No account, no email, no sign-in. Your results sit in your browser's localStorage and go nowhere else. Your scores will not follow you to another browser or another device, and clearing site data erases them.
The privacy policy covers what gets stored and what analytics see.
Guides
Knowing what moves your reaction time helps you train instead of guess. The guides cover how sleep and caffeine change your numbers, and which practice methods hold up.
See Where You Stand
Start with the reaction time test. Five rounds gives you an average, a rank, and a number to beat next time.
Take the Test