#666CE0#666CE0

#666CE0 is a mid, vivid blue. Relative luminance 0.189; OKLCH L 58.6% C 0.173 H 277.4°. Best body text is #000000 at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#666CE0
RGB	rgb(102, 108, 224)
HSL	hsl(237, 66%, 64%)
HSV	hsv(237, 54%, 88%)
CMYK	cmyk(54.5%, 51.8%, 0%, 12.2%)
CIE-LAB	lab(50.61, 30.22, -60.11)
CIE-LCH	lch(50.61, 67.28, 296.69°)
OKLab	oklab(58.6% 0.0223 -0.1718)
OKLCH	oklch(58.6% 0.173 277.4)
XYZ	xyz(24.2923, 18.9301, 72.8804)
Luminance	0.1893 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CE0 #E0DA66

analogous

#66A9E0 #666CE0 #9D66E0

triadic

#666CE0 #E0666C #6CE066

tetradic

#666CE0 #E066A9 #E0DA66 #66E09D

square

#666CE0 #E066A9 #E0DA66 #66E09D

split-complementary

#666CE0 #E09D66 #A9E066

monochromatic

#2229A9 #333BD6 #666CE0 #999DEA #CCCEF5

Accessibility & contrast

On white

4.39

#666CE0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.79

#666CE0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CE0

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CE0	#FFFFFF	#000000	##000000
##666CE0	1.00	4.39	4.79	4.79
#FFFFFF	4.39	1.00	21.00	21.00
#000000	4.79	21.00	1.00	1.00
##000000	4.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C7EE4

Deuteranopia (green-blind)

#1674DE

Tritanopia (blue-blind)

#29869C

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666ce0;
/* rgb */ color: rgb(102, 108, 224);
/* oklch */ color: oklch(58.6% 0.173 277.4);

Tailwind

colors: {
  custom: {
    50: '#9b96ea',
    500: '#666ce0',
    950: '#000000',
  },
}

SCSS

$custom: #666ce0;
$custom-light: #9b96ea;
$custom-dark: #000000;

JSON

{
  "hex": "#666ce0",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 224
  },
  "hsl": {
    "h": 237.049,
    "s": 66.304,
    "l": 63.922
  },
  "oklch": {
    "l": 0.58604,
    "c": 0.17328,
    "h": 277.4
  },
  "luminance": 0.18932
}

Semantic roles & 50–950 ramp

primary

#666CE0

secondary

#E6E4BC

accent

#C517CE

background

#FAF9FE

surface

#F3F1FD

border

#CDCBD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666CE0

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

Preview Lab → · Contrast checker → · Palette generator →