#666DCB#666DCB

#666DCB is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.4% C 0.143 H 277.7°. Best body text is #000000 at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#666DCB
RGB	rgb(102, 109, 203)
HSL	hsl(236, 49%, 60%)
HSV	hsv(236, 50%, 80%)
CMYK	cmyk(49.8%, 46.3%, 0%, 20.4%)
CIE-LAB	lab(49.58, 23.02, -49.82)
CIE-LCH	lch(49.58, 54.88, 294.80°)
OKLab	oklab(57.42% 0.0191 -0.1416)
OKLCH	oklch(57.42% 0.143 277.7)
XYZ	xyz(21.7243, 18.0726, 58.8320)
Luminance	0.1807 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DCB #CBC466

analogous

#669FCB #666DCB #9266CB

triadic

#666DCB #CB666D #6DCB66

tetradic

#666DCB #CB669F #CBC466 #66CB92

square

#666DCB #CB669F #CBC466 #66CB92

split-complementary

#666DCB #CB9266 #9FCB66

monochromatic

#2E3588 #3E46B6 #666DCB #9499DB #C1C4EA

Accessibility & contrast

On white

4.55

#666DCB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.61

#666DCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DCB

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DCB	#FFFFFF	#000000	##000000
##666DCB	1.00	4.55	4.61	4.61
#FFFFFF	4.55	1.00	21.00	21.00
#000000	4.61	21.00	1.00	1.00
##000000	4.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#457ACE

Deuteranopia (green-blind)

#3B72C9

Tritanopia (blue-blind)

#3E8192

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666dcb;
/* rgb */ color: rgb(102, 109, 203);
/* oklch */ color: oklch(57.4% 0.143 277.7);

Tailwind

colors: {
  custom: {
    50: '#9896db',
    500: '#666dcb',
    950: '#000000',
  },
}

SCSS

$custom: #666dcb;
$custom-light: #9896db;
$custom-dark: #000000;

JSON

{
  "hex": "#666dcb",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 203
  },
  "hsl": {
    "h": 235.842,
    "s": 49.268,
    "l": 59.804
  },
  "oklch": {
    "l": 0.57424,
    "c": 0.14287,
    "h": 277.7
  },
  "luminance": 0.18074
}

Semantic roles & 50–950 ramp

primary

#666DCB

secondary

#DAD7B3

accent

#CF4FD9

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666DCB

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

Preview Lab → · Contrast checker → · Palette generator →