#6366CB#6366CB

#6366CB is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.9% C 0.153 H 278.9°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#6366CB
RGB	rgb(99, 102, 203)
HSL	hsl(238, 50%, 59%)
HSV	hsv(238, 51%, 80%)
CMYK	cmyk(51.2%, 49.8%, 0%, 20.4%)
CIE-LAB	lab(47.58, 26.64, -53.04)
CIE-LCH	lch(47.58, 59.36, 296.67°)
OKLab	oklab(55.85% 0.0238 -0.1512)
OKLCH	oklch(55.85% 0.153 278.9)
XYZ	xyz(20.6731, 16.4660, 58.5772)
Luminance	0.1647 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366CB #CBC863

analogous

#639ACB #6366CB #9463CB

triadic

#6366CB #CB6366 #66CB63

tetradic

#6366CB #CB639A #CBC863 #63CB94

square

#6366CB #CB639A #CBC863 #63CB94

split-complementary

#6366CB #CB9463 #9ACB63

monochromatic

#2D2F87 #3C40B5 #6366CB #9193DA #BFC0EA

Accessibility & contrast

On white

4.89

#6366CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.29

#6366CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366CB

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366CB	#FFFFFF	#000000	##FFFFFF
##6366CB	1.00	4.89	4.29	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.29	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3675CF

Deuteranopia (green-blind)

#2B6DC9

Tritanopia (blue-blind)

#387C8F

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #6366cb;
/* rgb */ color: rgb(99, 102, 203);
/* oklch */ color: oklch(55.9% 0.153 278.9);

Tailwind

colors: {
  custom: {
    50: '#9691db',
    500: '#6366cb',
    950: '#000000',
  },
}

SCSS

$custom: #6366cb;
$custom-light: #9691db;
$custom-dark: #000000;

JSON

{
  "hex": "#6366cb",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 203
  },
  "hsl": {
    "h": 238.269,
    "s": 50,
    "l": 59.216
  },
  "oklch": {
    "l": 0.55854,
    "c": 0.15303,
    "h": 278.9
  },
  "luminance": 0.16467
}

Semantic roles & 50–950 ramp

primary

#6366CB

secondary

#D9D8B1

accent

#D54EDA

background

#F9F8FD

surface

#F2F0FB

border

#CCCBD4

text

#0E0C15

muted

#7E7D83

Preview Lab

Preview with #6366CB

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

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