Why this tool is useful
Use this visual test to compare perceived trailing and readability at several speeds after changing a display response-time, refresh-rate or overdrive setting.
Browser & Privacy · runs locally
Motion Blur Visual Test
Move a high-contrast target at a chosen CSS-pixel speed while measuring browser frame cadence for a bounded visual motion comparison.
Ready. Your working data stays in this browser.
How it works
A local requestAnimationFrame loop moves one CSS target across a clipped track for at most a few seconds and summarizes observed timing. It is a comparison aid, not a hardware diagnosis or response-time measurement.
Practical example
Run the same 480 CSS px/s pass before and after changing a monitor setting, keeping brightness and viewing distance constant, then compare the target edges by eye.
Validation
The test reports only browser-observable events and measurements; it does not invent hidden hardware health, temperature or manufacturer specifications.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.