#666CDB#666CDB

#666CDB is a mid, vivid blue. Relative luminance 0.187; OKLCH L 58.3% C 0.166 H 277.6°. Best body text is #000000 at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#666CDB
RGB	rgb(102, 108, 219)
HSL	hsl(237, 62%, 63%)
HSV	hsv(237, 53%, 86%)
CMYK	cmyk(53.4%, 50.7%, 0%, 14.1%)
CIE-LAB	lab(50.29, 28.64, -57.79)
CIE-LCH	lch(50.29, 64.50, 296.36°)
OKLab	oklab(58.27% 0.0219 -0.165)
OKLCH	oklch(58.27% 0.166 277.6)
XYZ	xyz(23.6242, 18.6629, 69.3615)
Luminance	0.1866 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CDB #DBD566

analogous

#66A6DB #666CDB #9A66DB

triadic

#666CDB #DB666C #6CDB66

tetradic

#666CDB #DB66A6 #DBD566 #66DB9A

square

#666CDB #DB66A6 #DBD566 #66DB9A

split-complementary

#666CDB #DB9A66 #A6DB66

monochromatic

#262CA1 #343CCF #666CDB #989CE7 #C9CBF2

Accessibility & contrast

On white

4.44

#666CDB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.73

#666CDB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CDB

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CDB	#FFFFFF	#000000	##000000
##666CDB	1.00	4.44	4.73	4.73
#FFFFFF	4.44	1.00	21.00	21.00
#000000	4.73	21.00	1.00	1.00
##000000	4.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#337DDF

Deuteranopia (green-blind)

#2273D9

Tritanopia (blue-blind)

#2F8599

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666cdb;
/* rgb */ color: rgb(102, 108, 219);
/* oklch */ color: oklch(58.3% 0.166 277.6);

Tailwind

colors: {
  custom: {
    50: '#9a96e7',
    500: '#666cdb',
    950: '#000000',
  },
}

SCSS

$custom: #666cdb;
$custom-light: #9a96e7;
$custom-dark: #000000;

JSON

{
  "hex": "#666cdb",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 219
  },
  "hsl": {
    "h": 236.923,
    "s": 61.905,
    "l": 62.941
  },
  "oklch": {
    "l": 0.58267,
    "c": 0.16647,
    "h": 277.6
  },
  "luminance": 0.18664
}

Semantic roles & 50–950 ramp

primary

#666CDB

secondary

#E3E1B9

accent

#C11CCA

background

#F9F9FE

surface

#F2F1FC

border

#CCCBD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666CDB

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

Preview Lab → · Contrast checker → · Palette generator →