Refresh Rate Test: Check Your Screen Hz
See your monitor or phone's real refresh rate (60, 120, 144 Hz or more) and dropped frames, with a moving block to judge smoothness.
Runs in your browser. Nothing is uploaded.
Refresh rate
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Measured
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Dropped frames
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Over the last few seconds
The block moves at the same speed on every screen. At 120 Hz and above it looks sharper and smoother than at 60 Hz; regular stutters mean dropped frames.
How the refresh rate is measured
The browser draws a new frame each time the screen refreshes, so the page times hundreds of frames and takes the middle value. A 60 Hz screen gives about 16.7 ms per frame, 120 Hz gives 8.3 ms and 144 Hz gives 6.9 ms. The big number is rounded to the nearest common rate; the measured line shows the exact figure. Keep this tab in front and leave the mouse still for a few seconds for the steadiest reading.
My 144 Hz monitor shows 60 Hz
The screen is running at 60 Hz, which is the default on most computers. On Windows 11 open Settings → System → Display → Advanced display and pick the higher rate under Choose a refresh rate; on Windows 10 it is under Display → Advanced display settings. On macOS open System Settings → Displays and set Refresh rate. The cable matters too: many monitors need DisplayPort, or HDMI 2.0 or newer, for 144 Hz at full resolution, and an old HDMI cable or adapter can cap it at 60. Reload the page after changing anything.
Phone shows 60 Hz instead of 90 or 120 Hz
Phones lower the rate to save battery. On Android, look under Settings → Display for Smooth display, Motion smoothness or Refresh rate and choose the high or adaptive setting; battery saver mode often forces 60 Hz. On iPhone Pro models, Safari is capped at 60 Hz unless Low Power Mode is off and, on older iOS versions, a Safari feature flag is turned on; the screen itself still runs at 120 Hz in apps.
Laptop on battery or a second monitor
Many laptops drop to 60 Hz on battery; plug in and reload. With two monitors at different rates, the browser follows the one its window is on, so drag the window to the screen you want to test. Some browsers also cap frame rate in power saving modes; Chrome's Energy Saver does this when the battery is low.
What dropped frames mean
A dropped frame is one that took much longer than the rest, which shows up as a small stutter in the moving block. A few percent is normal while other tabs or apps are busy. A high figure on an idle computer usually means the graphics driver, a power setting or another heavy app is holding the browser back. Close other tabs and check again before blaming the screen.
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