Keyboard Latency & N-Key Rollover Tester
Test simultaneous multi-key rollover (NKRO / anti-ghosting) and measure input-to-render reaction latency for mechanical gaming keyboards.
Press and hold multiple keys on your keyboard...
Technical Metrics & Telemetry
Max Simultaneous Keys
0
Current Active Keys
0
Event Response Latency
-- ms
How to Use This Tool
STEP 1
Press Multiple Keys Simultaneously
Rest your hands across your
keyboard and press down 6, 10, or more keys together.
STEP 2
Check for Key Ghosting
Verify that every pressed key is
registered in the live chip buffer above.
STEP 3
Evaluate Rollover Rating
If 10+ keys register
simultaneously without locking, your keyboard features full N-Key Rollover (NKRO).
Frequently Asked Questions
What is N-Key Rollover (NKRO)?
N-Key Rollover means every keypress is scanned independently by keyboard hardware. You can press as many
keys as you want simultaneously without any dropped inputs.
What is keyboard ghosting?
Ghosting occurs on cheaper membrane keyboards when pressing certain key combinations registers an
unintended extra key press due to shared matrix wiring.
What is the difference between 6KRO and NKRO?
6KRO keyboards can register up to 6 standard character keys plus modifiers at once, which is fine for
typing. True NKRO is preferred for rhythm games, emulators, and competitive gaming.
How does keyboard latency affect gaming?
Lower keyboard latency (1-5ms) ensures immediate character movement, strafing, and ability casting when
keys are triggered.