#377BBB#377BBB

#377BBB is a mid, vivid cyan. Relative luminance 0.186; OKLCH L 57.0% C 0.121 H 249.6°. Best body text is #000000 at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#377BBB
RGB	rgb(55, 123, 187)
HSL	hsl(209, 55%, 47%)
HSV	hsv(209, 71%, 73%)
CMYK	cmyk(70.6%, 34.2%, 0%, 26.7%)
CIE-LAB	lab(50.17, -0.11, -39.86)
CIE-LCH	lch(50.17, 39.86, 269.85°)
OKLab	oklab(56.95% -0.0421 -0.1131)
OKLCH	oklch(56.95% 0.121 249.6)
XYZ	xyz(17.6248, 18.5641, 49.6584)
Luminance	0.1857 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BBB #BB7737

analogous

#37BBB9 #377BBB #3739BB

triadic

#377BBB #BB377B #7BBB37

tetradic

#377BBB #B937BB #BB7737 #39BB37

square

#377BBB #B937BB #BB7737 #39BB37

split-complementary

#377BBB #BB3739 #BBB937

monochromatic

#1B3D5C #295C8C #377BBB #5F99D0 #8EB7DE

Accessibility & contrast

On white

4.46

#377BBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.71

#377BBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BBB

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BBB	#FFFFFF	#000000	##000000
##377BBB	1.00	4.46	4.71	4.71
#FFFFFF	4.46	1.00	21.00	21.00
#000000	4.71	21.00	1.00	1.00
##000000	4.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E7EBE

Deuteranopia (green-blind)

#4B72BA

Tritanopia (blue-blind)

#008A92

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #377bbb;
/* rgb */ color: rgb(55, 123, 187);
/* oklch */ color: oklch(57.0% 0.121 249.6);

Tailwind

colors: {
  custom: {
    50: '#7da0d0',
    500: '#377bbb',
    950: '#000000',
  },
}

SCSS

$custom: #377bbb;
$custom-light: #7da0d0;
$custom-dark: #000000;

JSON

{
  "hex": "#377bbb",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 187
  },
  "hsl": {
    "h": 209.091,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.5695,
    "c": 0.12068,
    "h": 249.6
  },
  "luminance": 0.18566
}

Semantic roles & 50–950 ramp

primary

#377BBB

secondary

#C9A685

accent

#924ADE

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #377BBB

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

Preview Lab → · Contrast checker → · Palette generator →