#378BC9#378BC9

#378BC9 is a mid, vivid cyan. Relative luminance 0.235; OKLCH L 61.4% C 0.124 H 244.3°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#378BC9
RGB	rgb(55, 139, 201)
HSL	hsl(205, 57%, 50%)
HSV	hsv(205, 73%, 79%)
CMYK	cmyk(72.6%, 30.8%, 0%, 21.2%)
CIE-LAB	lab(55.58, -4.59, -39.33)
CIE-LCH	lch(55.58, 39.60, 263.34°)
OKLab	oklab(61.43% -0.0535 -0.1114)
OKLCH	oklch(61.43% 0.124 244.3)
XYZ	xyz(21.3467, 23.4921, 58.6564)
Luminance	0.2349 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378BC9 #C97537

analogous

#37C9BE #378BC9 #3742C9

triadic

#378BC9 #C9378B #8BC937

tetradic

#378BC9 #BE37C9 #C97537 #42C937

square

#378BC9 #BE37C9 #C97537 #42C937

split-complementary

#378BC9 #C93742 #C9BE37

monochromatic

#1C4969 #296A99 #378BC9 #67A7D6 #97C3E3

Accessibility & contrast

On white

3.68

#378BC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#378BC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378BC9

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378BC9	#FFFFFF	#000000	##000000
##378BC9	1.00	3.68	5.70	5.70
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6F8DCC

Deuteranopia (green-blind)

#5A7FC8

Tritanopia (blue-blind)

#009AA1

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #378bc9;
/* rgb */ color: rgb(55, 139, 201);
/* oklch */ color: oklch(61.4% 0.124 244.3);

Tailwind

colors: {
  custom: {
    50: '#80acd9',
    500: '#378bc9',
    950: '#000000',
  },
}

SCSS

$custom: #378bc9;
$custom-light: #80acd9;
$custom-dark: #000000;

JSON

{
  "hex": "#378bc9",
  "rgb": {
    "r": 55,
    "g": 139,
    "b": 201
  },
  "hsl": {
    "h": 205.479,
    "s": 57.48,
    "l": 50.196
  },
  "oklch": {
    "l": 0.6143,
    "c": 0.12357,
    "h": 244.3
  },
  "luminance": 0.23495
}

Semantic roles & 50–950 ramp

primary

#378BC9

secondary

#CFA98D

accent

#8847E1

background

#F8FAFD

surface

#F0F4FA

border

#CBCED3

text

#0C1014

muted

#7D7F83

Preview Lab

Preview with #378BC9

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

Preview Lab → · Contrast checker → · Palette generator →