#377BB3#377BB3

#377BB3 is a mid, moderate cyan. Relative luminance 0.182; OKLCH L 56.5% C 0.111 H 246.4°. Best body text is #000000 at 4.65:1 contrast (WCAG AA passes).

Color values

HEX	#377BB3
RGB	rgb(55, 123, 179)
HSL	hsl(207, 53%, 46%)
HSV	hsv(207, 69%, 70%)
CMYK	cmyk(69.3%, 31.3%, 0%, 29.8%)
CIE-LAB	lab(49.78, -2.95, -35.87)
CIE-LCH	lch(49.78, 35.99, 265.29°)
OKLab	oklab(56.51% -0.0444 -0.1015)
OKLCH	oklch(56.51% 0.111 246.4)
XYZ	xyz(16.7921, 18.2310, 45.2730)
Luminance	0.1823 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BB3 #B36F37

analogous

#37B3AD #377BB3 #373DB3

triadic

#377BB3 #B3377B #7BB337

tetradic

#377BB3 #AD37B3 #B36F37 #3DB337

square

#377BB3 #AD37B3 #B36F37 #3DB337

split-complementary

#377BB3 #B3373D #B3AD37

monochromatic

#1A3B55 #295B84 #377BB3 #5B99CD #8AB6DB

Accessibility & contrast

On white

4.52

#377BB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.65

#377BB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BB3

4.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BB3	#FFFFFF	#000000	##000000
##377BB3	1.00	4.52	4.65	4.65
#FFFFFF	4.52	1.00	21.00	21.00
#000000	4.65	21.00	1.00	1.00
##000000	4.65	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#627DB5

Deuteranopia (green-blind)

#5171B2

Tritanopia (blue-blind)

#00888F

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #377bb3;
/* rgb */ color: rgb(55, 123, 179);
/* oklch */ color: oklch(56.5% 0.111 246.4);

Tailwind

colors: {
  custom: {
    50: '#7ca0ca',
    500: '#377bb3',
    950: '#000000',
  },
}

SCSS

$custom: #377bb3;
$custom-light: #7ca0ca;
$custom-dark: #000000;

JSON

{
  "hex": "#377bb3",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 179
  },
  "hsl": {
    "h": 207.097,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.56506,
    "c": 0.11078,
    "h": 246.4
  },
  "luminance": 0.18233
}

Semantic roles & 50–950 ramp

primary

#377BB3

secondary

#C5A081

accent

#8D4BDC

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0B0E13

muted

#7C7E82

Preview Lab

Preview with #377BB3

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

Preview Lab → · Contrast checker → · Palette generator →