What is measurable
Keydown and keyup timestamps, hold duration, and repeat intervals are available to the page. They reflect the full software path from OS to browser.
Keyboard Response Test
This test records the timing the browser can see: when keydown arrives, when keyup arrives, and how repeat events stream. It does not claim to measure physical switch latency.
Mobile note: Response measurement requires a physical keyboard.
esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
` 1 2 3 4 5 6 7 8 9 0 - = backspace
tab Q W E R T Y U I O P [ ] \
caps A S D F G H J K L ; ' enter
shift Z X C V B N M , . / shift
ctrl win alt space alt win menu ctrl
Detected state
Browser view Current held 0
Maximum held 0
Held keys None
Last hold Not measured
Repeat events 0
Limitations: this panel reports keyboard events delivered by the operating system to
this browser tab. It cannot measure hardware matrix behavior, firmware promises, USB polling, or true
physical latency.
About this test
What is not measurable
A web page cannot see switch actuation, USB polling, or driver processing. Do not use this test as a hardware latency benchmark.
How to read a hold
A short clean hold shows one keydown and one keyup. A long hold adds repeat keydowns after the OS repeat delay, which is normal behavior.
Related tools
Related guides
Is this a true latency test?
No. It measures browser-reported event timing, which includes OS and browser layers beyond the physical keyboard.
Why do repeat timings look irregular?
The OS repeat delay, system load, and browser timer resolution all affect the spacing between repeat events.