Refresh rate test: is your screen really 120Hz?

Measure the refresh rate your browser is actually getting, and watch a moving bar to spot stutter and skipped frames.

Measured refresh rate: …

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How it works

Your browser draws a new frame each time the screen refreshes. The test counts those frames over a few seconds to estimate your refresh rate, then moves a bar across the screen so you can judge smoothness with your own eyes. You can also see the measured value any time in the "Screen info" card on the home page.

Why it might show 60Hz on a 120Hz screen

Battery saver is on: most phones cap the screen at 60Hz in power saving mode.
Refresh rate setting: look for "Motion smoothness", "Screen refresh rate" or "ProMotion" in display settings and set it to high or adaptive.
iPhone and iPad (ProMotion): Safari — and every browser on iOS, since they all use Safari's engine — limits web pages to 60 fps by default, even on a 120Hz screen. Your screen is fine. To allow 120 fps in Safari: Settings → Apps → Safari → Advanced → Feature Flags → turn off "Prefer Page Rendering Updates near 60fps". Low Power Mode also caps it at 60.
Browser limits: some browsers drop to 60Hz while scrolling or in low-power mode. Try another browser.
Monitor cable or settings: on a PC, an old HDMI cable or a wrong setting in Windows display settings can lock you at 60Hz.

Signs of a problem

If the moving bar jumps, freezes for a moment or shows a tear line through it, the screen is skipping frames. That can come from a busy device, a power-saving mode or, on monitors, a mismatch between the game's frame rate and the screen's refresh rate.

Want the background? Read what 120Hz means for the difference between refresh rate, FPS and touch sampling rate.

Frequently asked questions

Why is the number slightly off, like 59 or 119?

Screens often run at fractional rates such as 59.94 Hz, and browsers round frame timing. A value within a few hertz of the expected rate is normal.

Does the test work on variable refresh rate screens?

Phones and monitors with adaptive refresh may lower the rate when nothing moves. The moving bar keeps the screen busy, so the test usually shows the highest rate the browser is allowed to use.

Can the browser show more than 60 Hz on my monitor?

Yes, if the monitor, cable, graphics settings and the operating system are all set to the higher rate. Most modern browsers follow the display's refresh rate.