Mac & Apple Keyboard Tester
Test every key on your keyboard, verify N-Key rollover, detect key chattering and ghosting online. Compatible with Windows, Mac, and Linux.
⌨️ Interactive Keyboard & Ghosting Tester
Understanding Keyboard Ghosting & Key Rollover (NKRO vs 6KRO)
What is Keyboard Ghosting?
Keyboard ghosting occurs when multiple keys are pressed simultaneously, and the keyboard's internal circuitry fails to register one or more keys—or generates an unpressed "ghost" key. This is caused by shared row-and-column wiring matrices on budget membrane keyboards lacking individual diodes per switch.
What is N-Key Rollover (NKRO)?
Premium mechanical keyboards feature diodes on every single key switch, enabling True NKRO (N-Key Rollover). With NKRO, you can press all 104 keys simultaneously without a single drop. Use our tool above to press common gaming clusters (e.g. W+A+Shift+Space) to ensure your keyboard doesn't jam during intense gameplay.