#366FCB#366FCB

#366FCB is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.2% C 0.155 H 259.6°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#366FCB
RGB	rgb(54, 111, 203)
HSL	hsl(217, 59%, 50%)
HSV	hsv(217, 73%, 80%)
CMYK	cmyk(73.4%, 45.3%, 0%, 20.4%)
CIE-LAB	lab(47.58, 13.00, -53.18)
CIE-LCH	lch(47.58, 54.74, 283.73°)
OKLab	oklab(55.21% -0.028 -0.1524)
OKLCH	oklch(55.21% 0.155 259.6)
XYZ	xyz(17.9813, 16.4630, 58.7183)
Luminance	0.1646 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#366FCB #CB9236

analogous

#36B9CB #366FCB #4736CB

triadic

#366FCB #CB366F #6FCB36

tetradic

#366FCB #CB36B9 #CB9236 #36CB47

square

#366FCB #CB36B9 #CB9236 #36CB47

split-complementary

#366FCB #CB4736 #B9CB36

monochromatic

#1C3A6B #28549C #366FCB #6792D8 #97B5E4

Accessibility & contrast

On white

4.89

#366FCB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.29

#366FCB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #366FCB

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##366FCB	#FFFFFF	#000000	##FFFFFF
##366FCB	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)

#4078CE

Deuteranopia (green-blind)

#206AC9

Tritanopia (blue-blind)

#008593

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #366fcb;
/* rgb */ color: rgb(54, 111, 203);
/* oklch */ color: oklch(55.2% 0.155 259.6);

Tailwind

colors: {
  custom: {
    50: '#8097db',
    500: '#366fcb',
    950: '#000000',
  },
}

SCSS

$custom: #366fcb;
$custom-light: #8097db;
$custom-dark: #000000;

JSON

{
  "hex": "#366fcb",
  "rgb": {
    "r": 54,
    "g": 111,
    "b": 203
  },
  "hsl": {
    "h": 217.047,
    "s": 58.893,
    "l": 50.392
  },
  "oklch": {
    "l": 0.5521,
    "c": 0.15494,
    "h": 259.6
  },
  "luminance": 0.16465
}

Semantic roles & 50–950 ramp

primary

#366FCB

secondary

#D0B68D

accent

#A646E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #366FCB

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

Preview Lab → · Contrast checker → · Palette generator →