Refresh rate estimate
Measure browser animation cadence over an eight-second sample.
Diagnostic visuals retain their original colors and remain visible. Presentation filters and high contrast apply outside this workspace; device-level filters may still affect your observation.
Keep this tab visible, stop other heavy tasks, and run the measurement on the display you want to check.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Keep this tab visible, stop other heavy tasks, and run the measurement on the display you want to check.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
requestAnimationFrame estimates presentation cadence. It does not read the physical panel specification.
If something seems wrong
Check the operating system refresh setting, cable limits, power mode and display selection.
Understanding browser permissions →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Standalone results remain in page memory. Guided checks offer optional coarse session recovery for 24 hours; it excludes media and detailed measurements. Hosting and Google Analytics requests still leave your browser. Analytics receives only broad test-usage categories, never these diagnostic contents. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.
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