#6366BB#6366BB

#6366BB is a mid, vivid blue. Relative luminance 0.157; OKLCH L 54.8% C 0.130 H 279.7°. Best body text is #FFFFFF at 5.06:1 contrast (WCAG AA passes).

Color values

HEX	#6366BB
RGB	rgb(99, 102, 187)
HSL	hsl(238, 39%, 56%)
HSV	hsv(238, 47%, 73%)
CMYK	cmyk(47.1%, 45.5%, 0%, 26.7%)
CIE-LAB	lab(46.63, 21.68, -45.32)
CIE-LCH	lch(46.63, 50.24, 295.56°)
OKLab	oklab(54.83% 0.0219 -0.1285)
OKLCH	oklch(54.83% 0.13 279.7)
XYZ	xyz(18.8639, 15.7423, 49.0487)
Luminance	0.1574 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366BB #BBB863

analogous

#6392BB #6366BB #8C63BB

triadic

#6366BB #BB6366 #66BB63

tetradic

#6366BB #BB6392 #BBB863 #63BB8C

square

#6366BB #BB6392 #BBB863 #63BB8C

split-complementary

#6366BB #BB8C63 #92BB63

monochromatic

#323472 #44479D #6366BB #8E90CE #B8BAE0

Accessibility & contrast

On white

5.06

#6366BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.15

#6366BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366BB

5.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366BB	#FFFFFF	#000000	##FFFFFF
##6366BB	1.00	5.06	4.15	5.06
#FFFFFF	5.06	1.00	21.00	1.00
#000000	4.15	21.00	1.00	21.00
##FFFFFF	5.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4472BE

Deuteranopia (green-blind)

#3D6BB9

Tritanopia (blue-blind)

#447887

Achromatopsia (no color)

#6E6E6E

Design tokens & code

CSS

--color: #6366bb;
/* rgb */ color: rgb(99, 102, 187);
/* oklch */ color: oklch(54.8% 0.130 279.7);

Tailwind

colors: {
  custom: {
    50: '#9491d0',
    500: '#6366bb',
    950: '#000000',
  },
}

SCSS

$custom: #6366bb;
$custom-light: #9491d0;
$custom-dark: #000000;

JSON

{
  "hex": "#6366bb",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 187
  },
  "hsl": {
    "h": 237.955,
    "s": 39.286,
    "l": 56.078
  },
  "oklch": {
    "l": 0.54834,
    "c": 0.13037,
    "h": 279.7
  },
  "luminance": 0.15743
}

Semantic roles & 50–950 ramp

primary

#6366BB

secondary

#CFCEAB

accent

#CB59CF

background

#F9F8FC

surface

#F2F0F9

border

#CCCBD2

text

#0E0C14

muted

#7E7D82

Preview Lab

Preview with #6366BB

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

Preview Lab → · Contrast checker → · Palette generator →