#337DB4#337DB4

#337DB4 is a mid, moderate cyan. Relative luminance 0.187; OKLCH L 56.9% C 0.112 H 244.3°. Best body text is #000000 at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#337DB4
RGB	rgb(51, 125, 180)
HSL	hsl(206, 56%, 45%)
HSV	hsv(206, 72%, 71%)
CMYK	cmyk(71.7%, 30.6%, 0%, 29.4%)
CIE-LAB	lab(50.29, -4.39, -35.64)
CIE-LCH	lch(50.29, 35.91, 262.97°)
OKLab	oklab(56.89% -0.0486 -0.1008)
OKLCH	oklch(56.89% 0.112 244.3)
XYZ	xyz(16.9339, 18.6644, 45.8813)
Luminance	0.1867 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337DB4 #B46A33

analogous

#33B4AA #337DB4 #333DB4

triadic

#337DB4 #B4337D #7DB433

tetradic

#337DB4 #AA33B4 #B46A33 #3DB433

square

#337DB4 #AA33B4 #B46A33 #3DB433

split-complementary

#337DB4 #B4333D #B4AA33

monochromatic

#183B55 #255C84 #337DB4 #559BCF #85B7DC

Accessibility & contrast

On white

4.44

#337DB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.73

#337DB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337DB4

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337DB4	#FFFFFF	#000000	##000000
##337DB4	1.00	4.44	4.73	4.73
#FFFFFF	4.44	1.00	21.00	21.00
#000000	4.73	21.00	1.00	1.00
##000000	4.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#647EB6

Deuteranopia (green-blind)

#5272B3

Tritanopia (blue-blind)

#008A90

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #337db4;
/* rgb */ color: rgb(51, 125, 180);
/* oklch */ color: oklch(56.9% 0.112 244.3);

Tailwind

colors: {
  custom: {
    50: '#7ba2ca',
    500: '#337db4',
    950: '#000000',
  },
}

SCSS

$custom: #337db4;
$custom-light: #7ba2ca;
$custom-dark: #000000;

JSON

{
  "hex": "#337db4",
  "rgb": {
    "r": 51,
    "g": 125,
    "b": 180
  },
  "hsl": {
    "h": 205.581,
    "s": 55.844,
    "l": 45.294
  },
  "oklch": {
    "l": 0.56894,
    "c": 0.11196,
    "h": 244.3
  },
  "luminance": 0.18666
}

Semantic roles & 50–950 ramp

primary

#337DB4

secondary

#C69C7D

accent

#8949DF

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0F13

muted

#7C7E82

Preview Lab

Preview with #337DB4

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

Preview Lab → · Contrast checker → · Palette generator →