#377BB5#377BB5

#377BB5 is a mid, moderate cyan. Relative luminance 0.183; OKLCH L 56.6% C 0.113 H 247.2°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#377BB5
RGB	rgb(55, 123, 181)
HSL	hsl(208, 53%, 46%)
HSV	hsv(208, 70%, 71%)
CMYK	cmyk(69.6%, 32%, 0%, 29%)
CIE-LAB	lab(49.87, -2.24, -36.87)
CIE-LCH	lch(49.87, 36.94, 266.52°)
OKLab	oklab(56.62% -0.0438 -0.1044)
OKLCH	oklch(56.62% 0.113 247.2)
XYZ	xyz(16.9959, 18.3125, 46.3461)
Luminance	0.1831 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BB5 #B57137

analogous

#37B5B0 #377BB5 #373CB5

triadic

#377BB5 #B5377B #7BB537

tetradic

#377BB5 #B037B5 #B57137 #3CB537

square

#377BB5 #B037B5 #B57137 #3CB537

split-complementary

#377BB5 #B5373C #B5B037

monochromatic

#1A3B57 #295B86 #377BB5 #5C99CD #8BB6DC

Accessibility & contrast

On white

4.50

#377BB5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#377BB5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BB5

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BB5	#FFFFFF	#000000	##000000
##377BB5	1.00	4.50	4.66	4.66
#FFFFFF	4.50	1.00	21.00	21.00
#000000	4.66	21.00	1.00	1.00
##000000	4.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#617DB8

Deuteranopia (green-blind)

#4F71B4

Tritanopia (blue-blind)

#008990

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #377bb5;
/* rgb */ color: rgb(55, 123, 181);
/* oklch */ color: oklch(56.6% 0.113 247.2);

Tailwind

colors: {
  custom: {
    50: '#7ca0cb',
    500: '#377bb5',
    950: '#000000',
  },
}

SCSS

$custom: #377bb5;
$custom-light: #7ca0cb;
$custom-dark: #000000;

JSON

{
  "hex": "#377bb5",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 181
  },
  "hsl": {
    "h": 207.619,
    "s": 53.39,
    "l": 46.275
  },
  "oklch": {
    "l": 0.56616,
    "c": 0.11322,
    "h": 247.2
  },
  "luminance": 0.18314
}

Semantic roles & 50–950 ramp

primary

#377BB5

secondary

#C6A182

accent

#8E4BDD

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0B0E13

muted

#7C7E82

Preview Lab

Preview with #377BB5

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

Preview Lab → · Contrast checker → · Palette generator →