Refresh Rate Test
Not the number in your settings — how many times per second this screen is actually drawing. Buying a 144Hz monitor and running it at 60Hz is a common mistake, and this catches it immediately.
🔧 Runs in the browser. Nothing to install, nothing uploaded.
Ready
–Hz
Keep this tab in view while it measures. Switch windows and the browser throttles the frames.
Check motion smoothness
If the square looks like it is stepping rather than gliding, either the refresh rate is low or something else has hold of the graphics.
What this test checks
- Measured refresh rate (Hz)
- Frame interval variance (stutter)
- Minimum and maximum frame time
- Compare motion smoothness by eye
Other device tests
Results depend on your browser and drivers. If something looks wrong here, try the same test in another browser before assuming the hardware is at fault.