Spacebar Reaction Time Test
This reaction time test measures how fast you respond to a visual signal. Each run includes 5 rounds: wait in the "wait" state, then press the spacebar the moment the indicator turns green. Valid reactions are timed in milliseconds; early presses are counted as false starts.
It is a simple way to track your reflexes, warm up before competitive gaming, or compare your reaction speed across different devices and browsers.
Press space to start round 1 of 5. Wait for green, then press space!
First tap/space starts the next round. Wait for green before pressing again.
Recent reaction runs
Last 5 reaction runs (5 rounds each).
Spacebar Reaction Time Test FAQ
What is a good reaction time?
For simple visual reaction tests like this one, many people fall somewhere between 200-300 ms. Very roughly:
- Over 350 ms: on the slower side or not fully focused
- 250-350 ms: typical range for most users
- 180-250 ms: fast reactions, above average
- Under 180 ms: very fast; may include some lucky guesses or borderline early presses
These numbers are approximate and are affected by your screen, input device, browser and how tired or distracted you are. The most useful comparison is between your own runs on the same computer or phone. If your average goes down over time and your best times get faster, your reflexes (or at least your test performance) are improving.
These ranges are approximate and meant only as rough guidelines.
What is this reaction time test?
It is an online reflex tester built around the spacebar. In each round, the screen waits for a random delay, then switches to a green "NOW" state. When you react with a spacebar press or tap, the test records your reaction time in milliseconds.
How do I use it?
Press the spacebar or tap the button to start a 5-round run. For every round, stay ready but do not press until the indicator turns green. As soon as you see green, hit the spacebar. If you press before green, that round becomes a false start and is not counted as a valid reaction. You can reset at any time if you want to restart the full 5-round run.
How should I read the results?
After a run, you will see how many valid reactions you had out of 5. The results show your average reaction time (only valid rounds), plus your best (fastest) and worst (slowest) valid reaction times. The "Recent reaction runs" list lets you compare your last few runs in this session.
Can I use this for gaming warm-ups or aim training?
Yes. Many players use this kind of reaction time test as a light warm-up before FPS, rhythm games or any title that rewards quick visual reactions. It does not simulate in-game latency, but it is a handy way to measure and track your raw reflexes.
Does it work on mobile and with the mouse?
Yes. You can tap the button on touch screens or click it with a mouse instead of using the spacebar. The timing and rules are the same, so you can use it on phones, tablets, and desktops.
How accurate is the reaction timing?
The test uses millisecond timestamps, but overall accuracy depends on your monitor, input device, browser, and system load. It is accurate enough for casual training and for comparing your own runs on the same setup, but not intended as a medical or lab-grade measurement of reaction time.
Is this tool free, safe, and local?
Yes. This tool is completely free and runs entirely in your browser. No account or installation is required, and your results are never sent to any server. All data stays on your device and is cleared when you refresh or close the page.