- Mouse Spin Test
- CPS Test
- Backlight Bleeding Test
- What Is My Screen Size
- Reaction Time Test
- APM Test
- Verbal Memory Test
- Spacebar Counter
- Mouse Polling Rate Test
- Color Memory Test
- Mic Test
- Keyboard Polling Rate Test
- Click Counter
- Aspect Ratio Calculator
- Dead Pixel Tester
- Jitter Click Test
- Chimp Test
- Number Memory Test
What Is a Keyboard Double-Click Test?
A keyboard double-click test checks whether a key registers twice from a single press. This is also called key chatter or key bounce. You may see it as repeated letters while typing, such as “heello” instead of “hello”.
This tool watches every key press and flags any key that is pressed again within a few milliseconds of being released. That gap is too short for a finger to press the key twice on purpose, so it is a strong sign of a double-click problem.
How to Use the Keyboard Double-Click Test
- Click the keyboard on the screen, or press Start.
- Type normally. Press each key you want to check several times.
- Watch the keyboard. A key flashes and shows a count badge each time it double-clicks.
- Click Stop when you are done. A result window opens.
Use the mouse to stop the test. Esc is one of the keys being tested, so it will not end the test.
Test Settings
Sensitivity: 30 ms, 50 ms or 80 ms
Sensitivity sets the time gap that counts as a double click. A key pressed again less than this long after it was released is flagged.
| Setting | What it flags |
|---|---|
| 30 ms | Only very short repeats. Fewest false alarms. |
| 50 ms | Default setting. A balanced choice. |
| 80 ms | Catches more repeats, but may flag very fast tapping. |
Start with 50 ms. If you suspect a problem that 50 ms misses, try 80 ms. If you get hits you think are false, try 30 ms. You can only change sensitivity before the test starts, and changing it resets the test.
Keyboard Size
The Size button cycles the on-screen keyboard through Full, TKL, 75%, 65% and 60%. Pick the layout closest to your own keyboard so you can see the keys you are pressing. Changing the size does not erase your results.
What You See During the Test
- Key presses: how many key presses were recorded.
- Double clicks: how many times a key registered twice.
- Bad keys: how many different keys had at least one double click.
- Error rate: double clicks as a share of all key presses.
On the keyboard, keys you have pressed turn green. Keys with a double click turn red and show how many times it happened. A message below the keyboard names the latest key and the gap between the two presses. For example, it can show that the second press came only 23 ms after release.
Understand Your Result
The result window shows the total double clicks, key presses, keys tested, error rate and the worst keys. Affected keys are listed with their count and the shortest gap found, such as “E ×3 (18 ms)”.
The verdict depends on how many double clicks were found:
| Verdict | When it appears |
|---|---|
| Healthy: no double clicks found | No double clicks in 40 or more key presses |
| No double clicks so far | No double clicks, but fewer than 40 presses |
| Minor: possible chatter | Error rate below 1% |
| Chatter detected: faulty switch likely | Error rate of 1% or more |
If you press fewer than 5 keys, the tool shows no result and asks you to press more.
Tips for Accurate Results
- Press every key you care about. The tool can only judge keys you actually press. Aim for at least 40 presses overall, and a few presses on each key.
- Focus on the keys that act up. If one key gives you double letters, press it 20 or more times.
- Press at a normal pace. Do not hold keys down. A held key is not counted as a repeat press.
- Run it twice. A single hit at 80 ms can come from very fast tapping. If the same key is flagged again, the problem is more likely real.
- Use the same sensitivity when you compare results before and after cleaning or replacing a switch.
When to Use This Test
- Your keyboard types double letters now and then.
- You are buying or selling a used keyboard and want to check it.
- You cleaned a key or replaced a switch and want to see if it helped.
- You want to check a new mechanical keyboard right after unboxing.
FAQs
Why doesn’t anything type while the test is running?
The test captures your key presses so they do not scroll the page or trigger other actions. Keys are typed normally again once you click Stop or Reset.
Why isn’t Caps Lock flagged for double clicks?
Caps Lock works differently on some systems, so it is left out of double-click detection. It still turns green when pressed.
Does a held-down key count as a double click?
No. Auto-repeat from holding a key is ignored. Only a new press after a release can be flagged.
Are keys that aren’t drawn on the on-screen keyboard counted?
Yes. They are counted in the totals and can appear in the affected keys list in the result window, even if you cannot see them on the layout.
What should I do if my keyboard shows chatter?
The tool shows that a key repeats, but it cannot tell you the cause. The result window notes that worn or dirty switches often cause this. Cleaning the key or replacing the switch can help. Test again afterwards to check.
Can I use the test on a phone or tablet?
You need a physical keyboard, such as a desktop, laptop or Bluetooth keyboard. On touch devices without one, the tool shows a note saying so.
Is the test result saved after I close the page?
The tool does not provide a way to save results. Note your results before you leave the page.