#377BCC#377BCC

#377BCC is a mid, vivid cyan. Relative luminance 0.193; OKLCH L 58.0% C 0.142 H 254.6°. Best body text is #000000 at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#377BCC
RGB	rgb(55, 123, 204)
HSL	hsl(213, 59%, 51%)
HSV	hsv(213, 73%, 80%)
CMYK	cmyk(73%, 39.7%, 0%, 20%)
CIE-LAB	lab(51.08, 6.04, -48.15)
CIE-LCH	lch(51.08, 48.53, 277.15°)
OKLab	oklab(57.95% -0.0378 -0.1374)
OKLCH	oklch(57.95% 0.142 254.6)
XYZ	xyz(19.5536, 19.3356, 59.8167)
Luminance	0.1934 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BCC #CC8837

analogous

#37C6CC #377BCC #3D37CC

triadic

#377BCC #CC377B #7BCC37

tetradic

#377BCC #CC37C6 #CC8837 #37CC3D

square

#377BCC #CC37C6 #CC8837 #37CC3D

split-complementary

#377BCC #CC3D37 #C6CC37

monochromatic

#1C416D #285E9E #377BCC #689BD8 #99BBE5

Accessibility & contrast

On white

4.31

#377BCC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.87

#377BCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BCC

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BCC	#FFFFFF	#000000	##000000
##377BCC	1.00	4.31	4.87	4.87
#FFFFFF	4.31	1.00	21.00	21.00
#000000	4.87	21.00	1.00	1.00
##000000	4.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5581CF

Deuteranopia (green-blind)

#3D73CA

Tritanopia (blue-blind)

#008E99

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #377bcc;
/* rgb */ color: rgb(55, 123, 204);
/* oklch */ color: oklch(58.0% 0.142 254.6);

Tailwind

colors: {
  custom: {
    50: '#81a0dc',
    500: '#377bcc',
    950: '#000000',
  },
}

SCSS

$custom: #377bcc;
$custom-light: #81a0dc;
$custom-dark: #000000;

JSON

{
  "hex": "#377bcc",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 204
  },
  "hsl": {
    "h": 212.617,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.57952,
    "c": 0.14249,
    "h": 254.6
  },
  "luminance": 0.19338
}

Semantic roles & 50–950 ramp

primary

#377BCC

secondary

#D0B28E

accent

#9B45E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #377BCC

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

Preview Lab → · Contrast checker → · Palette generator →