#378BD9#378BD9

#378BD9 is a light, vivid cyan. Relative luminance 0.243; OKLCH L 62.3% C 0.143 H 249.9°. Best body text is #000000 at 5.86:1 contrast (WCAG AA passes).

Color values

HEX	#378BD9
RGB	rgb(55, 139, 217)
HSL	hsl(209, 68%, 53%)
HSV	hsv(209, 75%, 85%)
CMYK	cmyk(74.7%, 35.9%, 0%, 14.9%)
CIE-LAB	lab(56.37, 1.10, -47.08)
CIE-LCH	lch(56.37, 47.10, 271.34°)
OKLab	oklab(62.32% -0.0491 -0.134)
OKLCH	oklch(62.32% 0.143 249.9)
XYZ	xyz(23.3278, 24.2845, 69.0901)
Luminance	0.2429 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378BD9 #D98537

analogous

#37D9D6 #378BD9 #373AD9

triadic

#378BD9 #D9378B #8BD937

tetradic

#378BD9 #D637D9 #D98537 #3AD937

square

#378BD9 #D637D9 #D98537 #3AD937

split-complementary

#378BD9 #D9373A #D9D637

monochromatic

#184D7E #226CB1 #378BD9 #6AA9E3 #9EC7ED

Accessibility & contrast

On white

3.59

#378BD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.86

#378BD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378BD9

5.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378BD9	#FFFFFF	#000000	##000000
##378BD9	1.00	3.59	5.86	5.86
#FFFFFF	3.59	1.00	21.00	21.00
#000000	5.86	21.00	1.00	1.00
##000000	5.86	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#678FDC

Deuteranopia (green-blind)

#4F80D7

Tritanopia (blue-blind)

#009EA8

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #378bd9;
/* rgb */ color: rgb(55, 139, 217);
/* oklch */ color: oklch(62.3% 0.143 249.9);

Tailwind

colors: {
  custom: {
    50: '#83ace5',
    500: '#378bd9',
    950: '#000000',
  },
}

SCSS

$custom: #378bd9;
$custom-light: #83ace5;
$custom-dark: #000000;

JSON

{
  "hex": "#378bd9",
  "rgb": {
    "r": 55,
    "g": 139,
    "b": 217
  },
  "hsl": {
    "h": 208.889,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.62317,
    "c": 0.14271,
    "h": 249.9
  },
  "luminance": 0.24287
}

Semantic roles & 50–950 ramp

primary

#378BD9

secondary

#D9B593

accent

#913DEB

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0C1016

muted

#7D7F84

Preview Lab

Preview with #378BD9

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

Preview Lab → · Contrast checker → · Palette generator →