#366ED3#366ED3

#366ED3 is a mid, vivid blue. Relative luminance 0.166; OKLCH L 55.5% C 0.167 H 261.1°. Best body text is #FFFFFF at 4.85:1 contrast (WCAG AA passes).

Color values

HEX	#366ED3
RGB	rgb(54, 110, 211)
HSL	hsl(219, 64%, 52%)
HSV	hsv(219, 74%, 83%)
CMYK	cmyk(74.4%, 47.9%, 0%, 17.3%)
CIE-LAB	lab(47.80, 16.59, -57.39)
CIE-LCH	lch(47.80, 59.74, 286.12°)
OKLab	oklab(55.54% -0.0259 -0.1648)
OKLCH	oklch(55.54% 0.167 261.1)
XYZ	xyz(18.8509, 16.6372, 63.8332)
Luminance	0.1664 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#366ED3 #D39B36

analogous

#36BCD3 #366ED3 #4D36D3

triadic

#366ED3 #D3366E #6ED336

tetradic

#366ED3 #D336BC #D39B36 #36D34D

square

#366ED3 #D336BC #D39B36 #36D34D

split-complementary

#366ED3 #D34D36 #BCD336

monochromatic

#1A3A75 #2553A7 #366ED3 #6892DE #9AB6E9

Accessibility & contrast

On white

4.85

#366ED3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.33

#366ED3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #366ED3

4.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##366ED3	#FFFFFF	#000000	##FFFFFF
##366ED3	1.00	4.85	4.33	4.85
#FFFFFF	4.85	1.00	21.00	1.00
#000000	4.33	21.00	1.00	21.00
##FFFFFF	4.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3679D7

Deuteranopia (green-blind)

#006BD1

Tritanopia (blue-blind)

#008696

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #366ed3;
/* rgb */ color: rgb(54, 110, 211);
/* oklch */ color: oklch(55.5% 0.167 261.1);

Tailwind

colors: {
  custom: {
    50: '#8296e1',
    500: '#366ed3',
    950: '#000000',
  },
}

SCSS

$custom: #366ed3;
$custom-light: #8296e1;
$custom-dark: #000000;

JSON

{
  "hex": "#366ed3",
  "rgb": {
    "r": 54,
    "g": 110,
    "b": 211
  },
  "hsl": {
    "h": 218.599,
    "s": 64.082,
    "l": 51.961
  },
  "oklch": {
    "l": 0.55543,
    "c": 0.16681,
    "h": 261.1
  },
  "luminance": 0.16639
}

Semantic roles & 50–950 ramp

primary

#366ED3

secondary

#D5BC90

accent

#AC41E7

background

#F8F9FD

surface

#F0F1FB

border

#CBCBD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #366ED3

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

Preview Lab → · Contrast checker → · Palette generator →