About neutral-500
#737373 is neutral-500, a tailwind v4. This page shows its rgb(115, 115, 115) / hsl(330, 0%, 45.1%) / oklch(0.5555 0 0) values, WCAG contrast against black and white, an OKLCH tint-and-shade ramp, and complementary, analogous, and triadic harmonies — all computed in perceptually-uniform OKLCH.