Measure your display's actual refresh rate via requestAnimationFrame timing. Detect ghosting, persistence, and motion blur. Works on any display — or in VR.
Immersive WebXR session — measure the actual rendered rate of your PCVR headset (Index at 144 Hz, etc.).
Measures your monitor, laptop, phone — anything that can render. 5 patterns: flash, moving bar, scrolling grid, strobe, UFO test. Live histogram of frame times.
