#666CD9#666CD9

#666CD9 is a mid, vivid blue. Relative luminance 0.186; OKLCH L 58.1% C 0.164 H 277.6°. Best body text is #000000 at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#666CD9
RGB	rgb(102, 108, 217)
HSL	hsl(237, 60%, 63%)
HSV	hsv(237, 53%, 85%)
CMYK	cmyk(53%, 50.2%, 0%, 14.9%)
CIE-LAB	lab(50.17, 28.01, -56.86)
CIE-LCH	lch(50.17, 63.38, 296.22°)
OKLab	oklab(58.13% 0.0218 -0.1623)
OKLCH	oklch(58.13% 0.164 277.6)
XYZ	xyz(23.3625, 18.5582, 67.9832)
Luminance	0.1856 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CD9 #D9D366

analogous

#66A5D9 #666CD9 #9A66D9

triadic

#666CD9 #D9666C #6CD966

tetradic

#666CD9 #D966A5 #D9D366 #66D99A

square

#666CD9 #D966A5 #D9D366 #66D99A

split-complementary

#666CD9 #D99A66 #A5D966

monochromatic

#272D9D #353DCD #666CD9 #979BE5 #C8CAF1

Accessibility & contrast

On white

4.46

#666CD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.71

#666CD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CD9

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CD9	#FFFFFF	#000000	##000000
##666CD9	1.00	4.46	4.71	4.71
#FFFFFF	4.46	1.00	21.00	21.00
#000000	4.71	21.00	1.00	1.00
##000000	4.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#357CDD

Deuteranopia (green-blind)

#2673D7

Tritanopia (blue-blind)

#318498

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666cd9;
/* rgb */ color: rgb(102, 108, 217);
/* oklch */ color: oklch(58.1% 0.164 277.6);

Tailwind

colors: {
  custom: {
    50: '#9a96e5',
    500: '#666cd9',
    950: '#000000',
  },
}

SCSS

$custom: #666cd9;
$custom-light: #9a96e5;
$custom-dark: #000000;

JSON

{
  "hex": "#666cd9",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 217
  },
  "hsl": {
    "h": 236.87,
    "s": 60.209,
    "l": 62.549
  },
  "oklch": {
    "l": 0.58133,
    "c": 0.16373,
    "h": 277.6
  },
  "luminance": 0.1856
}

Semantic roles & 50–950 ramp

primary

#666CD9

secondary

#E2E0B8

accent

#BF1EC8

background

#F9F9FE

surface

#F2F1FC

border

#CCCBD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666CD9

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

Preview Lab → · Contrast checker → · Palette generator →