Live measurement
Keep this tab visible and the window on the display you want to test.
Estimated refresh rate
—Hz
Ready to measure
Ready to measure0/240
Private, in-browser display diagnostics
Refresh Rate Test
A refresh rate test estimates how many new frames your browser and monitor present each second. Measure active display Hz, browser FPS, frame time, and stability without installing software or sending data anywhere.
Frame timing
Stable frame pacing matters as much as the headline refresh rate.
Average frame
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95th percentile
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Timing spread
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Stability
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Fastest frame
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Confidence
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Browser timing is an estimate. Confirm the configured value in macOS, Windows, or your display control panel if the result is unexpected.
Compare motion at common frame rates
Each marker takes the same path, but its position updates in discrete steps. Your display cannot show more unique steps than its active refresh rate.
30 FPS
60 FPS
120 FPS
144 FPS
240 FPS
Motion is disabled when your device requests reduced motion.
How to get a reliable result
1. Choose the display
Move this window to the monitor you want to measure and maximize it.
2. Keep the tab active
Start the test and avoid switching tabs, resizing, or running heavy work.
3. Confirm and retest
Compare the result with system settings, then repeat if confidence is low.
Refresh rate questions
What is a refresh rate test?
A refresh rate test estimates how many times per second your browser and display can present a new frame. The result is measured in hertz (Hz), where 60 Hz means up to 60 refreshes per second.
Is refresh rate the same as FPS?
No. Refresh rate is the display's update capacity, while FPS is the number of frames an app or game renders. Smooth output is limited by the lower of the two and can also be affected by frame pacing.
Why does this test show the wrong refresh rate?
Power saving, a background tab, browser throttling, variable refresh rate, an external monitor setting, or an overloaded device can change the measured result. Keep this tab visible and close heavy apps before retesting.
Can a browser test measure monitor Hz exactly?
A browser can estimate active presentation timing with requestAnimationFrame, but it cannot read every display-controller detail. Use the operating system's display settings to confirm the configured refresh rate.
Is a higher refresh rate better?
Higher refresh rates can make motion and input feel smoother when the device also renders enough frames. The benefit depends on content, hardware performance, response time, and personal sensitivity.
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