#6366DB#6366DB

#6366DB is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.9% C 0.175 H 278.2°. Best body text is #FFFFFF at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#6366DB
RGB	rgb(99, 102, 219)
HSL	hsl(239, 63%, 62%)
HSV	hsv(239, 55%, 86%)
CMYK	cmyk(54.8%, 53.4%, 0%, 14.1%)
CIE-LAB	lab(48.60, 31.69, -60.53)
CIE-LCH	lch(48.60, 68.33, 297.63°)
OKLab	oklab(56.94% 0.0249 -0.1732)
OKLCH	oklch(56.94% 0.175 278.2)
XYZ	xyz(22.6791, 17.2684, 69.1422)
Luminance	0.1727 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#6366DB #DBD863

analogous

#63A2DB #6366DB #9C63DB

triadic

#6366DB #DB6366 #66DB63

tetradic

#6366DB #DB63A2 #DBD863 #63DB9C

square

#6366DB #DB63A2 #DBD863 #63DB9C

split-complementary

#6366DB #DB9C63 #A2DB63

monochromatic

#25289F #3135D0 #6366DB #9597E6 #C6C8F2

Accessibility & contrast

On white

4.71

#6366DB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.45

#6366DB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #6366DB

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##6366DB	#FFFFFF	#000000	##FFFFFF
##6366DB	1.00	4.71	4.45	4.71
#FFFFFF	4.71	1.00	21.00	1.00
#000000	4.45	21.00	1.00	21.00
##FFFFFF	4.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F78DF

Deuteranopia (green-blind)

#006FD9

Tritanopia (blue-blind)

#268197

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #6366db;
/* rgb */ color: rgb(99, 102, 219);
/* oklch */ color: oklch(56.9% 0.175 278.2);

Tailwind

colors: {
  custom: {
    50: '#9991e7',
    500: '#6366db',
    950: '#000000',
  },
}

SCSS

$custom: #6366db;
$custom-light: #9991e7;
$custom-dark: #000000;

JSON

{
  "hex": "#6366db",
  "rgb": {
    "r": 99,
    "g": 102,
    "b": 219
  },
  "hsl": {
    "h": 238.5,
    "s": 62.5,
    "l": 62.353
  },
  "oklch": {
    "l": 0.56943,
    "c": 0.17498,
    "h": 278.2
  },
  "luminance": 0.1727
}

Semantic roles & 50–950 ramp

primary

#6366DB

secondary

#E3E2B7

accent

#C61BCA

background

#F9F8FE

surface

#F2F0FC

border

#CCCBD5

text

#0F0C16

muted

#7E7D84

Preview Lab

Preview with #6366DB

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

Preview Lab → · Contrast checker → · Palette generator →