❯devtools
Hardware Keyboard Tester
Verify multi-key rollover (NKRO), diagnose sticky switches, test ghosting nodes, and customize layout skins. (Keys like Fn and F1–F12 with OS conflicts can be clicked to test manually).
Layout TemplateMacBook Pro
Keys Calibrated0 / 78(0%)
Active Held Keys0 Keys Active
NKRO Rollover peak0 Max Congruent
Real-Time Core Stream
Press any physical key on your keyboard to instantly run verification scans.
Waiting for hardware event...
esc
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
Touch ID
~
`
!
1
@
2
#
3
$
4
%
5
^
6
&
7
*
8
(
9
)
0
_
-
+
=
delete
tab
Q
W
E
R
T
Y
U
I
O
P
{
[
}
]
|
\
caps lock
A
S
D
F
G
H
J
K
L
:
;
"
'
return
shift
Z
X
C
V
B
N
M
<
,
>
.
?
/
shift
fn
control
option
⌥
command
⌘
command
⌘
option
⌥
◀
▲
▼
▶
Layout Engine
Switch Synthesizer
Stem Profile
Synth Gain50%
Keycap Skin Colors
Anti-Ghosting Combos Checklist
Hold these key combinations simultaneously to test layout hardware bottlenecks.
WASD MovementStandard action/RPG character navigation
WASD
Pending
Cut / Copy / PasteMulti-rollover office modifier testing
ControlMetaXCV
Pending
Task Manager ComboWindows quick diagnostics toggle shortcut
ControlShiftEscape
Pending
Gaming Space JumpFrequent trigger key combo that blocks on bad keyboards
ShiftWSpace
Pending
Arrow NavigationDirectional cross tests
ArrowUpArrowDownArrowArrow
Pending
Hardware Signal Log
No hardware events loggedPhysical key logs will stream here in real-time
Browser Sandbox Hotkey RestrictionsTo maintain strict system isolation and protect your active environment, web browsers strictly sandbox keyboard events. Because of this, certain high-privilege system combinations (such as Cmd+Tab on macOS, Alt+Tab or Win/Super Key shortcuts on Windows, and Cmd+Q / Ctrl+W window closing triggers) cannot be fully bypassed by the tester canvas. If pressing them redirects focus or closes tabs, it is a normal browser security boundary, not a hardware fault!