#6366DD#6366DD

#6366DD is a mid, vivid blue. Relative luminance 0.174; OKLCH L 57.1% C 0.178 H 278.1°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#6366DD
RGB	rgb(99, 102, 221)
HSL	hsl(239, 64%, 63%)
HSV	hsv(239, 55%, 87%)
CMYK	cmyk(55.2%, 53.8%, 0%, 13.3%)
CIE-LAB	lab(48.73, 32.32, -61.45)
CIE-LCH	lch(48.73, 69.44, 297.74°)
OKLab	oklab(57.08% 0.025 -0.1759)
OKLCH	oklch(57.08% 0.178 278.1)
XYZ	xyz(22.9440, 17.3743, 70.5371)
Luminance	0.1738 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366DD #DDDA63

analogous

#63A3DD #6366DD #9D63DD

triadic

#6366DD #DD6366 #66DD63

tetradic

#6366DD #DD63A3 #DDDA63 #63DD9D

square

#6366DD #DD63A3 #DDDA63 #63DD9D

split-complementary

#6366DD #DD9D63 #A3DD63

monochromatic

#2326A2 #3135D2 #6366DD #9597E8 #C7C9F3

Accessibility & contrast

On white

4.69

#6366DD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#6366DD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366DD

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366DD	#FFFFFF	#000000	##FFFFFF
##6366DD	1.00	4.69	4.48	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B79E1

Deuteranopia (green-blind)

#006FDB

Tritanopia (blue-blind)

#238198

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #6366dd;
/* rgb */ color: rgb(99, 102, 221);
/* oklch */ color: oklch(57.1% 0.178 278.1);

Tailwind

colors: {
  custom: {
    50: '#9991e8',
    500: '#6366dd',
    950: '#000000',
  },
}

SCSS

$custom: #6366dd;
$custom-light: #9991e8;
$custom-dark: #000000;

JSON

{
  "hex": "#6366dd",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 221
  },
  "hsl": {
    "h": 238.525,
    "s": 64.211,
    "l": 62.745
  },
  "oklch": {
    "l": 0.57083,
    "c": 0.17767,
    "h": 278.1
  },
  "luminance": 0.17376
}

Semantic roles & 50–950 ramp

primary

#6366DD

secondary

#E4E3B8

accent

#C819CC

background

#F9F8FE

surface

#F2F0FD

border

#CCCBD5

text

#0F0C16

muted

#7E7D84

Preview Lab

Preview with #6366DD

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

Preview Lab → · Contrast checker → · Palette generator →