#666FC4#666FC4

#666FC4 is a mid, vivid blue. Relative luminance 0.182; OKLCH L 57.4% C 0.130 H 276.9°. Best body text is #000000 at 4.64:1 contrast (WCAG AA passes).

Color values

HEX	#666FC4
RGB	rgb(102, 111, 196)
HSL	hsl(234, 44%, 58%)
HSV	hsv(234, 48%, 77%)
CMYK	cmyk(48%, 43.4%, 0%, 23.1%)
CIE-LAB	lab(49.71, 19.63, -45.61)
CIE-LCH	lch(49.71, 49.65, 293.29°)
OKLab	oklab(57.39% 0.0157 -0.1292)
OKLCH	oklch(57.39% 0.13 276.9)
XYZ	xyz(21.1247, 18.1780, 54.6094)
Luminance	0.1818 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FC4 #C4BB66

analogous

#669EC4 #666FC4 #8C66C4

triadic

#666FC4 #C4666F #6FC466

tetradic

#666FC4 #C4669E #C4BB66 #66C48C

square

#666FC4 #C4669E #C4BB66 #66C48C

split-complementary

#666FC4 #C48C66 #9EC466

monochromatic

#31387F #424CAB #666FC4 #9299D5 #BEC2E6

Accessibility & contrast

On white

4.53

#666FC4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.64

#666FC4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FC4

4.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FC4	#FFFFFF	#000000	##000000
##666FC4	1.00	4.53	4.64	4.64
#FFFFFF	4.53	1.00	21.00	21.00
#000000	4.64	21.00	1.00	1.00
##000000	4.64	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D7AC7

Deuteranopia (green-blind)

#4573C2

Tritanopia (blue-blind)

#438190

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666fc4;
/* rgb */ color: rgb(102, 111, 196);
/* oklch */ color: oklch(57.4% 0.130 276.9);

Tailwind

colors: {
  custom: {
    50: '#9798d6',
    500: '#666fc4',
    950: '#000000',
  },
}

SCSS

$custom: #666fc4;
$custom-light: #9798d6;
$custom-dark: #000000;

JSON

{
  "hex": "#666fc4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 196
  },
  "hsl": {
    "h": 234.255,
    "s": 44.34,
    "l": 58.431
  },
  "oklch": {
    "l": 0.57393,
    "c": 0.13017,
    "h": 276.9
  },
  "luminance": 0.18179
}

Semantic roles & 50–950 ramp

primary

#666FC4

secondary

#D6D2B0

accent

#C854D4

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666FC4

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

Preview Lab → · Contrast checker → · Palette generator →