Keyboard Event Rate Test
Measure browser-observed keyboard event rates while you tap. Not a USB analyzer or hardware polling certification.
Tests run locally in your browser. We do not upload keystrokes, pointer paths, or media.
Important
- Browser-observed event rate only. Manual tapping is usually far below hardware scan rates.
Focus this surface, press Start, then tap continuously.
Browser-observed keyboard event rate — not USB hardware polling.
Browser-observed keyboard event rate (frozen after stop)
- Observed Hz
- —
- Current (throttled)
- —
- Median interval
- —
- Peak 1s events
- 0
- Valid keydowns
- 0
- Repeat samples
- 0
- Excluded other codes
- 0
- Non-alternating exclusions
- 0
- Repeat target
- —
- Capture state
- Ready
1000 / median interval
How to use
- Open this tool and follow the on-screen Start control.
- Keep the tab focused during measurement for accurate samples.
- Review results, limitations, and related tools below.
- Use Reset to clear local trial state when available.
What the result means
- Numbers come from browser APIs and local timing only.
- See Limitations for what this test cannot claim.
Limitations
- Browser-observed event rate only. Manual tapping is usually far below hardware scan rates.
Troubleshooting
- Nothing happens after Start
- Focus the tab, allow required permissions if prompted, and ensure the test surface receives input.
Related tools
Keyboard Tester
Press keys to verify browser keydown and keyup events across Windows, Mac, compact, and full-size layouts.
Keyboard Rollover Test
Observe simultaneous key reporting for free and guided combinations. Reports only keys the browser receives.
Keyboard Double-Press Test
Analyze possible duplicate key press cycles from browser keydown/keyup timing. Not a switch autopsy.
FAQ
Is this a hardware laboratory result?
No. DeviceMetrik reports browser-observed values with explicit limitations.