#6366B1#6366B1

#6366B1 is a mid, moderate blue. Relative luminance 0.153; OKLCH L 54.2% C 0.116 H 280.1°. Best body text is #FFFFFF at 5.16:1 contrast (WCAG AA passes).

Color values

HEX	#6366B1
RGB	rgb(99, 102, 177)
HSL	hsl(238, 33%, 54%)
HSV	hsv(238, 44%, 69%)
CMYK	cmyk(44.1%, 42.4%, 0%, 30.6%)
CIE-LAB	lab(46.08, 18.63, -40.38)
CIE-LCH	lch(46.08, 44.48, 294.77°)
OKLab	oklab(54.23% 0.0202 -0.1141)
OKLCH	oklch(54.23% 0.116 280.1)
XYZ	xyz(17.8304, 15.3289, 43.6057)
Luminance	0.1533 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366B1 #B1AE63

analogous

#638DB1 #6366B1 #8763B1

triadic

#6366B1 #B16366 #66B163

tetradic

#6366B1 #B1638D #B1AE63 #63B187

square

#6366B1 #B1638D #B1AE63 #63B187

split-complementary

#6366B1 #B18763 #8DB163

monochromatic

#333566 #484A8F #6366B1 #8C8EC5 #B5B6DA

Accessibility & contrast

On white

5.16

#6366B1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.07

#6366B1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366B1

5.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366B1	#FFFFFF	#000000	##FFFFFF
##6366B1	1.00	5.16	4.07	5.16
#FFFFFF	5.16	1.00	21.00	1.00
#000000	4.07	21.00	1.00	21.00
##FFFFFF	5.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A70B4

Deuteranopia (green-blind)

#456AAF

Tritanopia (blue-blind)

#4A7583

Achromatopsia (no color)

#6D6D6D

Design tokens & code

CSS

--color: #6366b1;
/* rgb */ color: rgb(99, 102, 177);
/* oklch */ color: oklch(54.2% 0.116 280.1);

Tailwind

colors: {
  custom: {
    50: '#9391c9',
    500: '#6366b1',
    950: '#000000',
  },
}

SCSS

$custom: #6366b1;
$custom-light: #9391c9;
$custom-dark: #000000;

JSON

{
  "hex": "#6366b1",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 177
  },
  "hsl": {
    "h": 237.692,
    "s": 33.333,
    "l": 54.118
  },
  "oklch": {
    "l": 0.54233,
    "c": 0.11584,
    "h": 280.1
  },
  "luminance": 0.1533
}

Semantic roles & 50–950 ramp

primary

#6366B1

secondary

#C8C7A7

accent

#C55EC9

background

#F9F8FC

surface

#F2F0F8

border

#CCCBD1

text

#0D0C13

muted

#7E7D82

Preview Lab

Preview with #6366B1

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

Preview Lab → · Contrast checker → · Palette generator →