#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
RGBrgb(55, 123, 204)
HSLhsl(213, 59%, 51%)
HSVhsv(213, 73%, 80%)
CMYKcmyk(73%, 39.7%, 0%, 20%)
CIE-LABlab(51.08, 6.04, -48.15)
CIE-LCHlch(51.08, 48.53, 277.15°)
OKLaboklab(57.95% -0.0378 -0.1374)
OKLCHoklch(57.95% 0.142 254.6)
XYZxyz(19.5536, 19.3356, 59.8167)
Luminance0.1934 (WCAG relative)
Temperaturecool
Familycyan

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
##377BCC1.004.314.874.87
#FFFFFF4.311.0021.0021.00
#0000004.8721.001.001.00
##0000004.8721.001.001.00

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 →

#377BCC Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva