#6366CC#6366CC

#6366CC is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.9% C 0.154 H 278.9°. Best body text is #FFFFFF at 4.88:1 contrast (WCAG AA passes).

Color values

HEX	#6366CC
RGB	rgb(99, 102, 204)
HSL	hsl(238, 51%, 59%)
HSV	hsv(238, 51%, 80%)
CMYK	cmyk(51.5%, 50%, 0%, 20%)
CIE-LAB	lab(47.64, 26.96, -53.52)
CIE-LCH	lch(47.64, 59.92, 296.73°)
OKLab	oklab(55.92% 0.0239 -0.1526)
OKLCH	oklch(55.92% 0.154 278.9)
XYZ	xyz(20.7927, 16.5138, 59.2069)
Luminance	0.1651 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366CC #CCC963

analogous

#639BCC #6366CC #9563CC

triadic

#6366CC #CC6366 #66CC63

tetradic

#6366CC #CC639B #CCC963 #63CC95

square

#6366CC #CC639B #CCC963 #63CC95

split-complementary

#6366CC #CC9563 #9BCC63

monochromatic

#2C2F88 #3C3FB6 #6366CC #9193DB #BFC0EA

Accessibility & contrast

On white

4.88

#6366CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#6366CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366CC

4.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366CC	#FFFFFF	#000000	##FFFFFF
##6366CC	1.00	4.88	4.30	4.88
#FFFFFF	4.88	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3575D0

Deuteranopia (green-blind)

#296DCA

Tritanopia (blue-blind)

#377C8F

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #6366cc;
/* rgb */ color: rgb(99, 102, 204);
/* oklch */ color: oklch(55.9% 0.154 278.9);

Tailwind

colors: {
  custom: {
    50: '#9691dc',
    500: '#6366cc',
    950: '#000000',
  },
}

SCSS

$custom: #6366cc;
$custom-light: #9691dc;
$custom-dark: #000000;

JSON

{
  "hex": "#6366cc",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 204
  },
  "hsl": {
    "h": 238.286,
    "s": 50.725,
    "l": 59.412
  },
  "oklch": {
    "l": 0.5592,
    "c": 0.15442,
    "h": 278.9
  },
  "luminance": 0.16515
}

Semantic roles & 50–950 ramp

primary

#6366CC

secondary

#DAD9B1

accent

#D64EDA

background

#F9F8FD

surface

#F2F0FB

border

#CCCBD4

text

#0E0C15

muted

#7E7D83

Preview Lab

Preview with #6366CC

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

Preview Lab → · Contrast checker → · Palette generator →