#337BBB#337BBB

#337BBB is a mid, vivid cyan. Relative luminance 0.185; OKLCH L 56.8% C 0.122 H 248.6°. Best body text is #000000 at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#337BBB
RGB	rgb(51, 123, 187)
HSL	hsl(208, 57%, 47%)
HSV	hsv(208, 73%, 73%)
CMYK	cmyk(72.7%, 34.2%, 0%, 26.7%)
CIE-LAB	lab(50.04, -0.69, -40.07)
CIE-LCH	lch(50.04, 40.07, 269.01°)
OKLab	oklab(56.81% -0.0446 -0.1138)
OKLCH	oklch(56.81% 0.122 248.6)
XYZ	xyz(17.4144, 18.4556, 49.6486)
Luminance	0.1846 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337BBB #BB7333

analogous

#33BBB7 #337BBB #3337BB

triadic

#337BBB #BB337B #7BBB33

tetradic

#337BBB #B733BB #BB7333 #37BB33

square

#337BBB #B733BB #BB7333 #37BB33

split-complementary

#337BBB #BB3337 #BBB733

monochromatic

#193C5B #265B8B #337BBB #5999D2 #89B7DF

Accessibility & contrast

On white

4.48

#337BBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.69

#337BBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337BBB

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337BBB	#FFFFFF	#000000	##000000
##337BBB	1.00	4.48	4.69	4.69
#FFFFFF	4.48	1.00	21.00	21.00
#000000	4.69	21.00	1.00	1.00
##000000	4.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E7EBE

Deuteranopia (green-blind)

#4A71BA

Tritanopia (blue-blind)

#008A92

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #337bbb;
/* rgb */ color: rgb(51, 123, 187);
/* oklch */ color: oklch(56.8% 0.122 248.6);

Tailwind

colors: {
  custom: {
    50: '#7ca0d0',
    500: '#337bbb',
    950: '#000000',
  },
}

SCSS

$custom: #337bbb;
$custom-light: #7ca0d0;
$custom-dark: #000000;

JSON

{
  "hex": "#337bbb",
  "rgb": {
    "r": 51,
    "g": 123,
    "b": 187
  },
  "hsl": {
    "h": 208.235,
    "s": 57.143,
    "l": 46.667
  },
  "oklch": {
    "l": 0.56812,
    "c": 0.12221,
    "h": 248.6
  },
  "luminance": 0.18458
}

Semantic roles & 50–950 ramp

primary

#337BBB

secondary

#C9A381

accent

#8F47E0

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #337BBB

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

Preview Lab → · Contrast checker → · Palette generator →