This double-click test detects mouse chatter. When a single physical press registers as two clicks because the switch is worn out. Click the button below at a normal, deliberate pace with single clicks. If the test flags fast double-fires you didn't intend, your mouse is chattering. It's one of the most common ways a mouse fails, and it makes dragging, selecting and gaming frustrating.
The test measures the time between consecutive presses of the same button. A deliberate double-click is spaced a couple of hundred milliseconds apart, but a chattering switch fires the second contact within a few milliseconds, far faster than any human can click twice. Any gap shorter than the threshold is counted as chatter and highlighted, and the shortest gap it has seen is shown so you can gauge how bad the problem is.
Inside the mouse, each button is a tiny mechanical switch. Over millions of clicks the metal contacts wear, oxidise or bounce, so one press briefly makes and breaks contact twice. The firmware's de-bounce filter usually hides this, but once the bounce outlasts the filter the extra click leaks through. Dust and humidity make it worse. It typically appears gradually, then becomes constant.
If the mouse is under warranty, a chatter result here is good evidence for a replacement. Otherwise you can sometimes clean the switch with contact cleaner, increase the de-bounce time in the mouse's software if it offers that, or replace the switch if you're comfortable soldering. Run this test again afterwards to confirm the fix.
The test only times the click events the page already receives. Nothing is installed, and nothing is uploaded. Test each button separately, and use the reset control to start a clean count.
It measures the time between two presses of the same button. A deliberate double-click is spaced a couple of hundred milliseconds apart, but a faulty switch fires its second contact within a few milliseconds, faster than any human can click. Gaps below the threshold are counted as chatter and highlighted.
Chatter is when one physical press of a mouse button registers as two clicks. It happens as the mechanical switch inside the button wears out and its contacts start to bounce, so the mouse sends an extra click the firmware fails to filter. It makes dragging, selecting and gaming unreliable.
Click the test button with single, deliberate clicks at a normal pace. Don't double-click on purpose. If the test reports double-fires you didn't intend, especially with very small gaps of a few milliseconds, the switch is chattering. Test each mouse button separately.
Sometimes. If it's under warranty, this test is good evidence for a replacement. Otherwise you can try cleaning the switch with contact cleaner, raising the de-bounce time in the mouse's software if that option exists, or replacing the switch if you can solder. Re-run the test afterwards to confirm.
No. Everything runs in your browser and only the timing of clicks on the test button is used. Nothing is recorded or uploaded, and there's no sign-up, refresh or reset to start over.
