#666DD0#666DD0

#666DD0 is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.7% C 0.150 H 277.6°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#666DD0
RGB	rgb(102, 109, 208)
HSL	hsl(236, 53%, 61%)
HSV	hsv(236, 51%, 82%)
CMYK	cmyk(51%, 47.6%, 0%, 18.4%)
CIE-LAB	lab(49.88, 24.57, -52.21)
CIE-LCH	lch(49.88, 57.70, 295.21°)
OKLab	oklab(57.74% 0.0197 -0.1486)
OKLCH	oklch(57.74% 0.15 277.6)
XYZ	xyz(22.3297, 18.3148, 62.0208)
Luminance	0.1832 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DD0 #D0C966

analogous

#66A2D0 #666DD0 #9466D0

triadic

#666DD0 #D0666D #6DD066

tetradic

#666DD0 #D066A2 #D0C966 #66D094

square

#666DD0 #D066A2 #D0C966 #66D094

split-complementary

#666DD0 #D09466 #A2D066

monochromatic

#2C3390 #3A43BE #666DD0 #959ADE #C4C6ED

Accessibility & contrast

On white

4.50

#666DD0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#666DD0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DD0

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DD0	#FFFFFF	#000000	##000000
##666DD0	1.00	4.50	4.66	4.66
#FFFFFF	4.50	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)

#407BD4

Deuteranopia (green-blind)

#3673CE

Tritanopia (blue-blind)

#3A8294

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666dd0;
/* rgb */ color: rgb(102, 109, 208);
/* oklch */ color: oklch(57.7% 0.150 277.6);

Tailwind

colors: {
  custom: {
    50: '#9896df',
    500: '#666dd0',
    950: '#000000',
  },
}

SCSS

$custom: #666dd0;
$custom-light: #9896df;
$custom-dark: #000000;

JSON

{
  "hex": "#666dd0",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 208
  },
  "hsl": {
    "h": 236.038,
    "s": 53,
    "l": 60.784
  },
  "oklch": {
    "l": 0.57739,
    "c": 0.1499,
    "h": 277.6
  },
  "luminance": 0.18316
}

Semantic roles & 50–950 ramp

primary

#666DD0

secondary

#DDDAB5

accent

#B625C0

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666DD0

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

Preview Lab → · Contrast checker → · Palette generator →