#337BB4#337BB4

#337BB4 is a mid, moderate cyan. Relative luminance 0.182; OKLCH L 56.4% C 0.114 H 245.8°. Best body text is #000000 at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#337BB4
RGB	rgb(51, 123, 180)
HSL	hsl(207, 56%, 45%)
HSV	hsv(207, 72%, 71%)
CMYK	cmyk(71.7%, 31.7%, 0%, 29.4%)
CIE-LAB	lab(49.69, -3.21, -36.59)
CIE-LCH	lch(49.69, 36.73, 264.99°)
OKLab	oklab(56.42% -0.0466 -0.1036)
OKLCH	oklch(56.42% 0.114 245.8)
XYZ	xyz(16.6833, 18.1632, 45.7978)
Luminance	0.1817 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337BB4 #B46C33

analogous

#33B4AD #337BB4 #333AB4

triadic

#337BB4 #B4337B #7BB433

tetradic

#337BB4 #AD33B4 #B46C33 #3AB433

square

#337BB4 #AD33B4 #B46C33 #3AB433

split-complementary

#337BB4 #B4333A #B4AD33

monochromatic

#183A55 #255A84 #337BB4 #5599CF #85B6DC

Accessibility & contrast

On white

4.53

#337BB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.63

#337BB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337BB4

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337BB4	#FFFFFF	#000000	##000000
##337BB4	1.00	4.53	4.63	4.63
#FFFFFF	4.53	1.00	21.00	21.00
#000000	4.63	21.00	1.00	1.00
##000000	4.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#617DB6

Deuteranopia (green-blind)

#4F71B3

Tritanopia (blue-blind)

#00898F

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #337bb4;
/* rgb */ color: rgb(51, 123, 180);
/* oklch */ color: oklch(56.4% 0.114 245.8);

Tailwind

colors: {
  custom: {
    50: '#7ba0ca',
    500: '#337bb4',
    950: '#000000',
  },
}

SCSS

$custom: #337bb4;
$custom-light: #7ba0ca;
$custom-dark: #000000;

JSON

{
  "hex": "#337bb4",
  "rgb": {
    "r": 51,
    "g": 123,
    "b": 180
  },
  "hsl": {
    "h": 206.512,
    "s": 55.844,
    "l": 45.294
  },
  "oklch": {
    "l": 0.56421,
    "c": 0.11363,
    "h": 245.8
  },
  "luminance": 0.18165
}

Semantic roles & 50–950 ramp

primary

#337BB4

secondary

#C69D7D

accent

#8B49DF

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #337BB4

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

Preview Lab → · Contrast checker → · Palette generator →