White Screens

White Screens turns any display into a light or a test tool. Open a pure white, black or color screen in one click, set color temperature and brightness, and keep the screen awake. It also has a dead pixel test, burn-in test, stuck pixel fixer, refresh rate test, test patterns, a video call light, plain background downloads and a fake broken screen prank. Runs in the browser on phones, laptops and TVs. Free, no sign-up.