Sinclairyola is a hosted scratchpad for visualizing CSS named colors. It displays the distribution of colors in a 3d RGB cube and it identifies nearest named colors to any arbitrary RGB color.
The best and easiest way to use it is to point your desktop or laptop browser to this GitHub pages-hosted site. While the color cube will rotate on a mobile device it won't zoom or display pertinent color information via tooltips.
Although the name derives from combining Sinclair and Crayola, it's pronounced the same way as Moviola, a brand of film editing equipment.