Spacebar Hold & Release Test
The hold & release test checks how accurately you can hit a target time. You set a hold duration (or let the test pick a random one), press and hold the spacebar, then try to release exactly when the target is reached.
After each attempt, you see how early or late you were in milliseconds. It is a simple timing trainer you can use for internal clock practice, rhythm training, or just a challenging mini-game.
Press and hold, then release near the target time shown above.
Recent hold & release attempts
Last 5 attempts (stored only in this session).
Hold & Release Test FAQ
How accurate is my timing?
For hold & release, the important value is the error (how early or late you released compared to the target time):
- Within ±50 ms: very precise for casual timing; excellent control
- ±50-150 ms: decent accuracy, especially for longer targets
- ±150-300 ms: loose timing; you are near the target but still off by a clear margin
- Over ±300 ms: very rough timing; you are mostly guessing the duration instead of feeling it
Short targets (for example 500 ms) are naturally harder to hit precisely than longer ones (for example 2000 ms), so it is normal if your error is a bit larger on very short durations. A good sign is when your typical error band shrinks over time and your “early vs late” tendency becomes more balanced instead of always overshooting in the same direction.
These ranges are approximate and meant only as rough guidelines.
What is the hold & release test?
It is a timing challenge where you try to hold down the spacebar for a specific target time and release as precisely as possible. Each attempt compares your actual hold time to the target time and shows the difference.
How do I use it?
Choose a fixed target time from the presets or select Custom to enter your own target. You can also select Random to get a different target duration for each attempt. Once the target is set and visible, press and hold the spacebar or tap area to start. Release when you think you have reached the target. Very short accidental taps are ignored so they do not skew the results. Reset cancels an attempt so you can try again with a fresh target.
How should I read the results?
After an attempt, the test shows your target time, your actual hold time and the error in milliseconds. A positive error means you released late (you held too long), and a negative error means you released early. The recent attempts list lets you see several attempts in this session so you can track whether your timing is getting closer to zero error.
What can I use this for?
This test is useful for training your internal sense of time, practicing precise timing for rhythm games or music, or simply challenging friends to see who can get closest to the target. It is also a nice way to see how steady your timing is when targets keep changing in random mode.
Does it work on mobile and with a mouse?
Yes. You can hold and release using the spacebar, mouse button, or touch the main button on a phone or tablet. The timing logic is the same, so you can practice on any device with a modern browser.
How accurate is the timing?
Timed durations and release moments are measured in milliseconds by your browser. That is accurate enough for practice and casual comparison. Latency from your device, input hardware and browser may affect exact numbers slightly, so treat it as a practical training tool rather than a scientific measurement.
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.