This visual check can be useful when setting up a monitor, inspecting a second-hand screen, or comparing display configurations. Make sure you can see the whole display comfortably; the moving reference starts paused, so you can prepare before motion begins.
How to use Refresh Rate Test
- Select Start Test to open the test view. Use Fullscreen if you want the pattern to fill the screen, and Exit fullscreen or Escape to leave it.
- Use Previous and Next to move between available samples. The displayed Pattern mode is Moving timing reference.
- Choose a Target speed: 120 CSS px/s, 240 CSS px/s, or 480 CSS px/s. Keep the same speed when comparing settings.
- Select Start motion to begin. Observe the moving reference and the reported fps, then use Space to start or pause motion when needed.
- After changing display settings, restart the sample before comparing again. Use Reset or the R shortcut to restore the page; F toggles fullscreen.
When to use it
- Checking a new monitor: Look for unexpected judder or uneven-looking motion while you can still report concerns to the seller.
- Inspecting a used display: Run the moving sample before buying to get a quick visual impression of its motion.
- Comparing refresh-rate settings: Change one display setting at a time and restart the sample to compare the result consistently.
- Checking a new cable or connection: Compare the motion after reconnecting or changing the display setup to see whether its appearance changes.
- Reviewing a graphics setting: Test before and after changing a setting that may affect how motion is presented.
- Noticing motion problems in everyday use: Use the reference as an initial check if scrolling or moving objects look irregular.
- Choosing a comfortable speed: Try the available target speeds to see which moving sample is easiest for you to inspect.
Tips for a useful check
Keep the browser and display setup the same while comparing samples, and change only one setting at a time. Start with a speed that is easy to follow, then try another target speed if you want to compare the appearance at a different pace.
Reported fps describes browser animation callbacks, not certified panel Hz. Treat it as an observation about the browser's animation timing rather than proof of the monitor's actual refresh rate. Browser load, power saving, compositing and whether the page is in a background tab can affect the timing. Hidden tabs, offscreen patterns and reduced motion pause the motion; resume it explicitly with Start motion or Space.
Limits of Refresh Rate Test
Refresh Rate Test is a visual browser check, not a calibrated instrument for measuring a display's true refresh rate. The reported fps can differ from the panel's supported or configured Hz, so use your operating system's display settings or the manufacturer's specifications when you need to confirm supported modes.
The sample cannot repair a display or establish the cause of a motion issue. If a problem remains after checking settings and comparing samples, test with ordinary content or another source, then contact the seller or manufacturer if you suspect a hardware fault. Stop the moving sample if it causes discomfort.