Tests/Matrix Diagnostic

Keyboard and Mouse Tester

Verify 104-key actuation, benchmark simultaneous N-Key Rollover (NKRO), and test mouse button matrix inputs.

Focus:
Tested Keys
0/ 104
Current Held
0keys
Peak Rollover (NKRO)
0keys
Rollover TierReady
Last Key--
Keyboard Active: Press any key
EscF1F2F3F4F5F6F7F8F9F10F11F12PrtScScrLkPause`1234567890-=BackspaceInsHomePgUpNum/*-TabQWERTYUIOP[]\DelEndPgDn789+CapsASDFGHJKL;'Enter456ShiftZXCVBNM,./Shift▲123EntCtrlWinAltSPACEAltFn≡Ctrl◀▼▶0.
Live Actuation & Matrix Jamming Stream0 keystrokes
Active KeyTested / Registered
No keystrokes recorded yet. Press any key or multi-key chord on your keyboard to begin.
Keyboard Rollover Hierarchy

N-Key Rollover & Actuation Performance

Comparing simultaneous key actuation caps and matrix ghosting characteristics across keyboard switch architectures.

Pro Tier Hierarchy
1

Wooting 60HE+ / Apex Pro (Hall Effect Magnetic)

True NKRO + Rapid Trigger
Top 99th Percentile
Switch TechnologyFull NKRO
Rollover Capacity0.1mm - 4.0mm Dynamic
Actuation Spec0ms Contact Delay
2

Custom Mechanical (Dioded PCB / QMK)

Full Mechanical NKRO
Top 95th Percentile
Switch TechnologyFull NKRO
Rollover Capacity1.5mm - 2.0mm Fixed
Actuation Spec1ms - 3ms Debounce
3

Standard USB Gaming Keyboard

6KRO / 10KRO
Top 60th Percentile
Switch Technology6KRO + Modifiers
Rollover Capacity2.0mm Fixed
Actuation Spec5ms Debounce
Tournament telemetry aggregated from competitive esports databases.
Pro League Telemetry
Matrix Science

Understanding Keyboard Rollover & Ghosting

N-Key Rollover (NKRO)

Unlimited Inputs

NKRO ensures that every single key pressed simultaneously is registered by the OS without key blocking or missing inputs.

Matrix Ghosting

Circuit Limitation

Ghosting occurs on membrane keyboards when pressing multiple keys on a shared grid causes an unpressed adjacent key to register falsely.

USB 6KRO Limit

Legacy USB Spec

The standard USB Human Interface Device (HID) boot protocol only supports 6 simultaneous alphanumeric keys plus modifier keys. Modern gaming keyboards bypass this by emulating multiple virtual HID devices or utilizing custom multi-byte USB descriptors.

Debounce & Actuation Point

Switch Response

Mechanical switch contacts bounce when struck. Keyboard microcontrollers apply a digital debounce algorithm (typically 1ms to 5ms). Magnetic Hall Effect and optical keyboard switches actuate with zero physical contact, delivering instant response without debounce delay.

Keyboard Tester Frequently Asked Questions

  • NKRO means a keyboard can detect every key pressed simultaneously without key ghosting or matrix limitations.