#377BB1#377BB1

#377BB1 is a mid, moderate cyan. Relative luminance 0.182; OKLCH L 56.4% C 0.108 H 245.5°. Best body text is #000000 at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#377BB1
RGB	rgb(55, 123, 177)
HSL	hsl(207, 53%, 45%)
HSV	hsv(207, 69%, 69%)
CMYK	cmyk(68.9%, 30.5%, 0%, 30.6%)
CIE-LAB	lab(49.68, -3.66, -34.87)
CIE-LCH	lch(49.68, 35.06, 264.01°)
OKLab	oklab(56.4% -0.045 -0.0986)
OKLCH	oklch(56.4% 0.108 245.5)
XYZ	xyz(16.5913, 18.1507, 44.2155)
Luminance	0.1815 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BB1 #B16D37

analogous

#37B1AA #377BB1 #373EB1

triadic

#377BB1 #B1377B #7BB137

tetradic

#377BB1 #AA37B1 #B16D37 #3EB137

square

#377BB1 #AA37B1 #B16D37 #3EB137

split-complementary

#377BB1 #B1373E #B1AA37

monochromatic

#1A3A54 #285B82 #377BB1 #5A99CC #88B6DA

Accessibility & contrast

On white

4.54

#377BB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.63

#377BB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BB1

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BB1	#FFFFFF	#000000	##000000
##377BB1	1.00	4.54	4.63	4.63
#FFFFFF	4.54	1.00	21.00	21.00
#000000	4.63	21.00	1.00	1.00
##000000	4.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#637DB3

Deuteranopia (green-blind)

#5271B0

Tritanopia (blue-blind)

#00888E

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #377bb1;
/* rgb */ color: rgb(55, 123, 177);
/* oklch */ color: oklch(56.4% 0.108 245.5);

Tailwind

colors: {
  custom: {
    50: '#7ca1c8',
    500: '#377bb1',
    950: '#000000',
  },
}

SCSS

$custom: #377bb1;
$custom-light: #7ca1c8;
$custom-dark: #000000;

JSON

{
  "hex": "#377bb1",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 177
  },
  "hsl": {
    "h": 206.557,
    "s": 52.586,
    "l": 45.49
  },
  "oklch": {
    "l": 0.56398,
    "c": 0.10835,
    "h": 245.5
  },
  "luminance": 0.18152
}

Semantic roles & 50–950 ramp

primary

#377BB1

secondary

#C49E80

accent

#8C4CDC

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0B0E13

muted

#7C7E82

Preview Lab

Preview with #377BB1

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

Preview Lab → · Contrast checker → · Palette generator →