Tests
Fullscreen Color
Choose a standard or custom color and enter fullscreen. Use the arrow controls or swipe to change color; Exit returns to the page.
Private by designProcessing happens locally in this browser. Device streams and raw readings are not uploaded.
What this test checks
How to use this test
Choose a standard or custom color and enter fullscreen. Use the arrow controls or swipe to change color; Exit returns to the page.
What the results mean
A solid background helps you inspect marks, uneven brightness and color differences by eye.
Troubleshooting
Leave fullscreen to change brightness or disable night-light filters, then compare again.
Browser limitation
Fullscreen may be unavailable in some browsers. The in-page color remains usable. Brightness and color profiles change appearance; this does not calibrate your display.