#666FD0#666FD0

#666FD0 is a mid, vivid blue. Relative luminance 0.187; OKLCH L 58.1% C 0.147 H 276.8°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#666FD0
RGB	rgb(102, 111, 208)
HSL	hsl(235, 53%, 61%)
HSV	hsv(235, 51%, 82%)
CMYK	cmyk(51%, 46.6%, 0%, 18.4%)
CIE-LAB	lab(50.39, 23.35, -51.39)
CIE-LCH	lch(50.39, 56.45, 294.44°)
OKLab	oklab(58.13% 0.0174 -0.1462)
OKLCH	oklch(58.13% 0.147 276.8)
XYZ	xyz(22.5455, 18.7464, 62.0927)
Luminance	0.1875 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FD0 #D0C766

analogous

#66A4D0 #666FD0 #9266D0

triadic

#666FD0 #D0666F #6FD066

tetradic

#666FD0 #D066A4 #D0C766 #66D092

square

#666FD0 #D066A4 #D0C766 #66D092

split-complementary

#666FD0 #D09266 #A4D066

monochromatic

#2C3590 #3A46BE #666FD0 #959BDE #C4C7ED

Accessibility & contrast

On white

4.42

#666FD0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#666FD0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FD0

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FD0	#FFFFFF	#000000	##000000
##666FD0	1.00	4.42	4.75	4.75
#FFFFFF	4.42	1.00	21.00	21.00
#000000	4.75	21.00	1.00	1.00
##000000	4.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#447CD4

Deuteranopia (green-blind)

#3A74CE

Tritanopia (blue-blind)

#3A8495

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666fd0;
/* rgb */ color: rgb(102, 111, 208);
/* oklch */ color: oklch(58.1% 0.147 276.8);

Tailwind

colors: {
  custom: {
    50: '#9898df',
    500: '#666fd0',
    950: '#000000',
  },
}

SCSS

$custom: #666fd0;
$custom-light: #9898df;
$custom-dark: #000000;

JSON

{
  "hex": "#666fd0",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 208
  },
  "hsl": {
    "h": 234.906,
    "s": 53,
    "l": 60.784
  },
  "oklch": {
    "l": 0.58128,
    "c": 0.14722,
    "h": 276.8
  },
  "luminance": 0.18748
}

Semantic roles & 50–950 ramp

primary

#666FD0

secondary

#DDDAB5

accent

#B325C0

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FD0

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

Preview Lab → · Contrast checker → · Palette generator →