Initializing, please wait a moment

Click Start to begin; results render below as the diagnostic runs.

Estimated refresh rate

-- Hz

Ready. Click Start measuring to sample requestAnimationFrame timing in this tab. Nothing is uploaded.

frames: 0 | avgDelta: -- ms | samples: 0

Monitor Refresh Rate Test (Hz)

Last reviewed: 2026-07-21

Estimate your display refresh rate from requestAnimationFrame timing in the browser.

Click Start measuring, keep this tab visible, and read the live Hz estimate from frame deltas.

Stop or Reset anytime; nothing is uploaded and no account is required. No camera or microphone permission is requested.

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Last updated: Jul 21, 2026

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Frequently Asked Questions

What does Monitor Refresh Rate Test (Hz) measure?

It samples requestAnimationFrame timestamps and estimates Hz from the median frame delta. Results stay in the tab.

Do I need camera or microphone access?

No. This tool uses animation-frame timing only - no getUserMedia.

Why does the reading drop when I switch tabs?

Background tabs throttle requestAnimationFrame. Keep this tab in the foreground while measuring.

Is timing data uploaded?

No. Samples stay in the page session. Reset clears them; closing the tab drops them.