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Manual control · no automatic flashing
Refresh-rate test
Measure foreground animation-frame timestamps, report an approximate hertz value, and keep variable-refresh and throttling limits visible.
Fullscreen is optional. Press Escape at any time to leave it.
Keep this tab visible on the target display. Variable refresh and browser throttling can change the result.
Reduced motion is respected; the decorative marker is disabled and does not affect measurement.
- Approximate rate
- — Hz
- Median frame interval
- — ms
- Usable samples
- —
Approximate browser estimate—not hardware certification.