Click Fullscreen to start. Use arrow keys (or the Next / Prev buttons) to step through colors. Solid full-screen white or a primary color for 30-60 seconds reveals retention. Press Esc to exit.
Current color
White
Tip: leave the scrolling refresher running overnight to help OLED panels recover from mild short-term image retention. Burn-in that persists after 8 hours of full-screen white is permanent; the refresher will not fix it.