I added a HUSL (previous name of HSLuv) option to my color-changing clock a while back http://lumma.org/code/js/colortime http://lumma.org/code/js/colortime Y

I added a HUSL (previous name of HSLuv) option to my color-changing clock a while back http://lumma.org/code/js/colortime http://lumma.org/code/js/colortime You can think of it as a constant-brightness version of the HSV option. AFAIK it's the only one of these clocks with HSLuv, and the only one that matches the color gamut to a unit of time, so you know where you are in the hour (or day) at a glance.