#666CD3#666CD3

#666CD3 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.7% C 0.155 H 277.8°. Best body text is #000000 at 4.65:1 contrast (WCAG AA passes).

Color values

HEX	#666CD3
RGB	rgb(102, 108, 211)
HSL	hsl(237, 55%, 61%)
HSV	hsv(237, 52%, 83%)
CMYK	cmyk(51.7%, 48.8%, 0%, 17.3%)
CIE-LAB	lab(49.80, 26.12, -54.04)
CIE-LCH	lch(49.80, 60.02, 295.80°)
OKLab	oklab(57.74% 0.0212 -0.154)
OKLCH	oklch(57.74% 0.155 277.8)
XYZ	xyz(22.5962, 18.2517, 63.9476)
Luminance	0.1825 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CD3 #D3CD66

analogous

#66A3D3 #666CD3 #9766D3

triadic

#666CD3 #D3666C #6CD366

tetradic

#666CD3 #D366A3 #D3CD66 #66D397

square

#666CD3 #D366A3 #D3CD66 #66D397

split-complementary

#666CD3 #D39766 #A3D366

monochromatic

#2B3094 #3840C4 #666CD3 #969AE1 #C5C7EE

Accessibility & contrast

On white

4.52

#666CD3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.65

#666CD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CD3

4.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CD3	#FFFFFF	#000000	##000000
##666CD3	1.00	4.52	4.65	4.65
#FFFFFF	4.52	1.00	21.00	21.00
#000000	4.65	21.00	1.00	1.00
##000000	4.65	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C7BD7

Deuteranopia (green-blind)

#3072D1

Tritanopia (blue-blind)

#378395

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666cd3;
/* rgb */ color: rgb(102, 108, 211);
/* oklch */ color: oklch(57.7% 0.155 277.8);

Tailwind

colors: {
  custom: {
    50: '#9996e1',
    500: '#666cd3',
    950: '#000000',
  },
}

SCSS

$custom: #666cd3;
$custom-light: #9996e1;
$custom-dark: #000000;

JSON

{
  "hex": "#666cd3",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 211
  },
  "hsl": {
    "h": 236.697,
    "s": 55.33,
    "l": 61.373
  },
  "oklch": {
    "l": 0.57739,
    "c": 0.15544,
    "h": 277.8
  },
  "luminance": 0.18253
}

Semantic roles & 50–950 ramp

primary

#666CD3

secondary

#DFDDB6

accent

#BA23C3

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666CD3

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →