Tools
Refresh rate test
Keep this tab in front for a few seconds. We'll measure how often your screen updates.
How the test works
Frame timing
Browsers draw once per display refresh. We time a few hundred frames, discard hiccups, and snap to the nearest common rate.
Motion clarity
Objects move across the screen at a known speed. Higher refresh rates and faster pixels show sharper edges.
What your results mean
Lower than you expected
Check the refresh rate in your display settings, use a cable and port that support it, and turn off battery saving.
Unstable reading
Variable refresh (G-SYNC, FreeSync, ProMotion) and background work can make the reading move. Close other tabs and try again.
Questions
Why is my 144 Hz monitor running at 60 Hz?
Usually the display setting, the cable (older HDMI can't carry high rates) or the port. Our guide shows how to set it on Windows and macOS.
Can a browser measure refresh rate exactly?
Not exactly. It measures how often the browser draws, which normally matches the display. That's why we label it an estimate.