#666CD4#666CD4

#666CD4 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.8% C 0.157 H 277.8°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#666CD4
RGB	rgb(102, 108, 212)
HSL	hsl(237, 56%, 62%)
HSV	hsv(237, 52%, 83%)
CMYK	cmyk(51.9%, 49.1%, 0%, 16.9%)
CIE-LAB	lab(49.86, 26.44, -54.51)
CIE-LCH	lch(49.86, 60.58, 295.87°)
OKLab	oklab(57.8% 0.0213 -0.1554)
OKLCH	oklch(57.8% 0.157 277.8)
XYZ	xyz(22.7220, 18.3020, 64.6099)
Luminance	0.1830 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CD4 #D4CE66

analogous

#66A3D4 #666CD4 #9766D4

triadic

#666CD4 #D4666C #6CD466

tetradic

#666CD4 #D466A3 #D4CE66 #66D497

square

#666CD4 #D466A3 #D4CE66 #66D497

split-complementary

#666CD4 #D49766 #A3D466

monochromatic

#2A3096 #373FC5 #666CD4 #969AE1 #C6C8EF

Accessibility & contrast

On white

4.51

#666CD4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#666CD4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CD4

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CD4	#FFFFFF	#000000	##000000
##666CD4	1.00	4.51	4.66	4.66
#FFFFFF	4.51	1.00	21.00	21.00
#000000	4.66	21.00	1.00	1.00
##000000	4.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B7BD8

Deuteranopia (green-blind)

#2E72D2

Tritanopia (blue-blind)

#378396

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666cd4;
/* rgb */ color: rgb(102, 108, 212);
/* oklch */ color: oklch(57.8% 0.157 277.8);

Tailwind

colors: {
  custom: {
    50: '#9996e2',
    500: '#666cd4',
    950: '#000000',
  },
}

SCSS

$custom: #666cd4;
$custom-light: #9996e2;
$custom-dark: #000000;

JSON

{
  "hex": "#666cd4",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 212
  },
  "hsl": {
    "h": 236.727,
    "s": 56.122,
    "l": 61.569
  },
  "oklch": {
    "l": 0.57805,
    "c": 0.15682,
    "h": 277.8
  },
  "luminance": 0.18303
}

Semantic roles & 50–950 ramp

primary

#666CD4

secondary

#DFDDB6

accent

#BB22C4

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666CD4

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

Preview Lab → · Contrast checker → · Palette generator →