#337AB1#337AB1

#337AB1 is a mid, moderate cyan. Relative luminance 0.178; OKLCH L 56.0% C 0.111 H 245.2°. Best body text is #FFFFFF at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#337AB1
RGB	rgb(51, 122, 177)
HSL	hsl(206, 55%, 45%)
HSV	hsv(206, 71%, 69%)
CMYK	cmyk(71.2%, 31.1%, 0%, 30.6%)
CIE-LAB	lab(49.25, -3.69, -35.55)
CIE-LCH	lch(49.25, 35.74, 264.08°)
OKLab	oklab(56.02% -0.0466 -0.1006)
OKLCH	oklch(56.02% 0.111 245.2)
XYZ	xyz(16.2576, 17.7954, 44.1645)
Luminance	0.1780 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337AB1 #B16A33

analogous

#33B1A9 #337AB1 #333BB1

triadic

#337AB1 #B1337A #7AB133

tetradic

#337AB1 #A933B1 #B16A33 #3BB133

square

#337AB1 #A933B1 #B16A33 #3BB133

split-complementary

#337AB1 #B1333B #B1A933

monochromatic

#183952 #255981 #337AB1 #5498CE #83B5DB

Accessibility & contrast

On white

4.61

#337AB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.56

#337AB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #337AB1

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337AB1	#FFFFFF	#000000	##FFFFFF
##337AB1	1.00	4.61	4.56	4.61
#FFFFFF	4.61	1.00	21.00	1.00
#000000	4.56	21.00	1.00	21.00
##FFFFFF	4.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#617CB3

Deuteranopia (green-blind)

#5070B0

Tritanopia (blue-blind)

#00878D

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #337ab1;
/* rgb */ color: rgb(51, 122, 177);
/* oklch */ color: oklch(56.0% 0.111 245.2);

Tailwind

colors: {
  custom: {
    50: '#7aa0c8',
    500: '#337ab1',
    950: '#000000',
  },
}

SCSS

$custom: #337ab1;
$custom-light: #7aa0c8;
$custom-dark: #000000;

JSON

{
  "hex": "#337ab1",
  "rgb": {
    "r": 51,
    "g": 122,
    "b": 177
  },
  "hsl": {
    "h": 206.19,
    "s": 55.263,
    "l": 44.706
  },
  "oklch": {
    "l": 0.56021,
    "c": 0.11087,
    "h": 245.2
  },
  "luminance": 0.17797
}

Semantic roles & 50–950 ramp

primary

#337AB1

secondary

#C59B7B

accent

#8A49DF

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #337AB1

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

Preview Lab → · Contrast checker → · Palette generator →