Exploring the Color #818BDD

#818BDD sits at 233° on the color wheel, placing it in the blue family of the cool half of the spectrum. With 58% saturation and 69% lightness, it reads as a moderately saturated, light tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 129, 139, 221 produces a 6.67:1 contrast ratio against black, which clears WCAG AA for body text in that pairing.

In RGB space #818BDD is a clear variant of CSS slate blue — about 56 units away from #6A5ACD. Designers reach for blue hues at this saturation when the brief calls for a conversational, mid-energy register, 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