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 calculation is deterministic and explains validation errors instead of silently changing invalid input.
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.