Estimate your display's refresh rate

Press Measure: the run takes four seconds during which the tab must stay visible.

• requestAnimationFrame timestamps measure the browser-compositor pipeline, not the panel directly. Hidden tabs, battery saver, and off-screen windows throttle rAF, which only lowers the honest ceiling of the estimate.
• The median resists dropped frames; long frames are counted and disclosed instead of averaged away, and a sample with a wide spread is flagged rather than smoothed.
• No benchmark claims: no latency numbers, no cross-device comparison, no "gaming performance" story: those need a methodology this page does not have.
• Odd panels quantize (a 59.94 Hz display reads ~60), a rate within 2% of a common one is labeled "consistent with", never declared identical.