Keyboard tester
Press any key. Every keypress lights up below, so you can spot dead switches, chatter and ghosting in seconds. The rollover counter shows how many simultaneous keys your board actually registers (NKRO test). Full TKL layout with nav cluster and arrow keys, in ANSI or ISO; numpad and media keys are not drawn but still count in the stats. Works with any keyboard, no install.
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Unique keys
Keys not registering? Sometimes it is the PCB, not the switch.
I repair mechanical keyboard PCBs (dead switches, broken hotswap sockets, botched solder jobs) and hand-build small-batch programmable macropads in Barcelona.