Refresh Rate Test

A free test that measures the refresh rate your monitor is actually running at, in hertz. Bought a 144Hz or 165Hz panel and want to be sure Windows did not quietly leave it at 60Hz? This samples the browser's animation cadence for a few seconds, reports the measured rate, snaps it to the nearest standard, and flags stutter. A moving bar shows you the smoothness live while it measures.

Read the Refresh Rate Test guide for help reading the verdict or fixing a rate that is stuck too low.

What this measures: the frame cadence the browser gets from your display through requestAnimationFrame - the effective refresh rate for anything drawn on screen. It is not a value read from the graphics driver, and a background or inactive tab is throttled, so keep this tab in front while it runs. Everything happens in this tab; nothing is uploaded. View source to verify.

Configuration

Driver: requestAnimationFrame cadence sampler

Takes about 4 seconds. Keep this tab in the foreground - the reading comes from the browser's animation cadence, entirely in this tab, and nothing is uploaded.

Status Check Step

Pending

Sample the animation cadence

Runs a requestAnimationFrame loop for a few seconds, timing every frame, while a live bar glides across the screen.

1 of 2

Pending

Measured rate and jank

Takes the median frame time so a few stray frames cannot skew the Hz reading, snaps it to the nearest standard rate, and flags frame-time variance.

2 of 2