Exploring the Color #637A75

#637A75 sits at 167° on the color wheel, placing it in the cyan family of the cool half of the spectrum. With 10% saturation and 43% lightness, it reads as a heavily muted, shadowed tone — a quiet, restrained presence that recedes rather than competes. Its RGB mix of 99, 122, 117 produces a 4.59:1 contrast ratio against white, which clears WCAG AA for body text in that pairing.

In RGB space #637A75 is a close cousin of CSS dim gray — about 22 units away from #696969. Designers reach for cyan hues at this saturation when the brief calls for restraint and atmosphere, and at this lightness when they want a present, comfortable mid-canvas voice. On screen the cool cast tends to pair best with warm neutrals in the 25°-45° range to add life.

Darkening Shades

Lightening Shades