#377BB9#377BB9

#377BB9 is a mid, moderate cyan. Relative luminance 0.185; OKLCH L 56.8% C 0.118 H 248.8°. Best body text is #000000 at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#377BB9
RGB	rgb(55, 123, 185)
HSL	hsl(209, 54%, 47%)
HSV	hsv(209, 70%, 73%)
CMYK	cmyk(70.3%, 33.5%, 0%, 27.5%)
CIE-LAB	lab(50.07, -0.82, -38.86)
CIE-LCH	lch(50.07, 38.87, 268.79°)
OKLab	oklab(56.84% -0.0426 -0.1102)
OKLCH	oklch(56.84% 0.118 248.8)
XYZ	xyz(17.4122, 18.4790, 48.5387)
Luminance	0.1848 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BB9 #B97537

analogous

#37B9B6 #377BB9 #373AB9

triadic

#377BB9 #B9377B #7BB937

tetradic

#377BB9 #B637B9 #B97537 #3AB937

square

#377BB9 #B637B9 #B97537 #3AB937

split-complementary

#377BB9 #B9373A #B9B637

monochromatic

#1B3C5B #295C8A #377BB9 #5E99CF #8DB7DD

Accessibility & contrast

On white

4.47

#377BB9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.70

#377BB9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BB9

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BB9	#FFFFFF	#000000	##000000
##377BB9	1.00	4.47	4.70	4.70
#FFFFFF	4.47	1.00	21.00	21.00
#000000	4.70	21.00	1.00	1.00
##000000	4.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5F7EBC

Deuteranopia (green-blind)

#4D72B8

Tritanopia (blue-blind)

#008A91

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #377bb9;
/* rgb */ color: rgb(55, 123, 185);
/* oklch */ color: oklch(56.8% 0.118 248.8);

Tailwind

colors: {
  custom: {
    50: '#7da0ce',
    500: '#377bb9',
    950: '#000000',
  },
}

SCSS

$custom: #377bb9;
$custom-light: #7da0ce;
$custom-dark: #000000;

JSON

{
  "hex": "#377bb9",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 185
  },
  "hsl": {
    "h": 208.615,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.56837,
    "c": 0.11817,
    "h": 248.8
  },
  "luminance": 0.18481
}

Semantic roles & 50–950 ramp

primary

#377BB9

secondary

#C8A484

accent

#914ADE

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0E13

muted

#7C7E82

Preview Lab

Preview with #377BB9

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

Preview Lab → · Contrast checker → · Palette generator →