#666DD4#666DD4

#666DD4 is a mid, vivid blue. Relative luminance 0.185; OKLCH L 58.0% C 0.155 H 277.5°. Best body text is #000000 at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666DD4
RGB	rgb(102, 109, 212)
HSL	hsl(236, 56%, 62%)
HSV	hsv(236, 52%, 83%)
CMYK	cmyk(51.9%, 48.6%, 0%, 16.9%)
CIE-LAB	lab(50.11, 25.83, -54.11)
CIE-LCH	lch(50.11, 59.95, 295.52°)
OKLab	oklab(58% 0.0202 -0.1542)
OKLCH	oklch(58% 0.155 277.5)
XYZ	xyz(22.8281, 18.5141, 64.6453)
Luminance	0.1852 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DD4 #D4CD66

analogous

#66A4D4 #666DD4 #9666D4

triadic

#666DD4 #D4666D #6DD466

tetradic

#666DD4 #D466A4 #D4CD66 #66D496

square

#666DD4 #D466A4 #D4CD66 #66D496

split-complementary

#666DD4 #D49666 #A4D466

monochromatic

#2A3196 #3740C5 #666DD4 #969BE1 #C6C8EF

Accessibility & contrast

On white

4.47

#666DD4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.70

#666DD4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DD4

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DD4	#FFFFFF	#000000	##000000
##666DD4	1.00	4.47	4.70	4.70
#FFFFFF	4.47	1.00	21.00	21.00
#000000	4.70	21.00	1.00	1.00
##000000	4.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D7CD8

Deuteranopia (green-blind)

#3173D2

Tritanopia (blue-blind)

#368496

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666dd4;
/* rgb */ color: rgb(102, 109, 212);
/* oklch */ color: oklch(58.0% 0.155 277.5);

Tailwind

colors: {
  custom: {
    50: '#9996e2',
    500: '#666dd4',
    950: '#000000',
  },
}

SCSS

$custom: #666dd4;
$custom-light: #9996e2;
$custom-dark: #000000;

JSON

{
  "hex": "#666dd4",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 212
  },
  "hsl": {
    "h": 236.182,
    "s": 56.122,
    "l": 61.569
  },
  "oklch": {
    "l": 0.57996,
    "c": 0.15548,
    "h": 277.5
  },
  "luminance": 0.18516
}

Semantic roles & 50–950 ramp

primary

#666DD4

secondary

#DFDDB6

accent

#B922C4

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666DD4

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

Preview Lab → · Contrast checker → · Palette generator →