01 / THE TEST
Your keyboard may quietly drop keys when you hold too many.
This page listens to the physical positions your browser reports. Three chords. About one minute. Nothing is sent anywhere.
CHORD 1 / 3
Waiting for the first key
Hold every lit key at the same time.
Use the physical positions shown. Keep holding until the field answers.
CHORD RECEIVED
4/4
Every position made it through.
Release the keys to continue.
FREE HOLD
Now hold as many keys as you can.
Any positions. Any shape. Six wakes the whole field.
0 held now · maximum 0
TOUCH SURFACE
0/5
How many fingers can this page hear?
Press different circles together. Four wakes the field. This checks browser touch reporting, not keyboard rollover.
Maximum heard together · 0