Keyboard Test Bench
Push any keys in any combination, including all of them at once. Everything you hold is named live below, so you can verify every note and chord sounds right.
Now playing
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0 notes held
Sound on: turn your volume up and make sure your device is not on silent.
Play with your mouse, touch, or computer keyboard (A-L row = white keys, W E T Y U row = black keys)Tap the keys to play
Key coverage
0/18Play every mapped computer key at least once to light them all up.
Most notes held at once this session: 0
Event log
▼ = note on, ▲ = note off. If a ▼ ever has no matching ▲ after you let go, that's a stuck note. Tell John!
waiting for input…
Try these combos
- • A + D + G together → should read C Major
- • A + F + G → C Sus4
- • S + F + H → D Minor
- • A + D + G + U → C Dominant 7th
- • D + G + K → C Major / E bass (1st inversion)
- • A + K → C + C (Octave)
- • Hold Shift or Caps Lock while playing, still works
- • Mash the whole row at once, then release: nothing should stick
If a key seems to “miss” when mashing many at once
That's almost always the physical keyboard, not the app. Most consumer keyboards can only register 3-6 simultaneous presses in certain clusters (called “rollover” or “ghosting”), so the missed key never reaches the browser at all. Check the event log: if there's no ▼ for a key you pressed, the hardware dropped it. Gaming keyboards with N-key rollover register everything; normal playing (2-4 note chords) is well within any keyboard's limits.