#378FBB#378FBB

#378FBB is a mid, moderate cyan. Relative luminance 0.240; OKLCH L 61.7% C 0.106 H 234.1°. Best body text is #000000 at 5.81:1 contrast (WCAG AA passes).

Color values

HEX	#378FBB
RGB	rgb(55, 143, 187)
HSL	hsl(200, 55%, 47%)
HSV	hsv(200, 71%, 73%)
CMYK	cmyk(70.6%, 23.5%, 0%, 26.7%)
CIE-LAB	lab(56.13, -11.72, -30.52)
CIE-LCH	lch(56.13, 32.70, 249.00°)
OKLab	oklab(61.66% -0.062 -0.0858)
OKLCH	oklch(61.66% 0.106 234.1)
XYZ	xyz(20.3641, 24.0427, 50.5715)
Luminance	0.2404 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378FBB #BB6337

analogous

#37BBA5 #378FBB #374DBB

triadic

#378FBB #BB378F #8FBB37

tetradic

#378FBB #A537BB #BB6337 #4DBB37

square

#378FBB #A537BB #BB6337 #4DBB37

split-complementary

#378FBB #BB374D #BBA537

monochromatic

#1B475C #296B8C #378FBB #5FAAD0 #8EC3DE

Accessibility & contrast

On white

3.62

#378FBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.81

#378FBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378FBB

5.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378FBB	#FFFFFF	#000000	##000000
##378FBB	1.00	3.62	5.81	5.81
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.81	21.00	1.00	1.00
##000000	5.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7A8EBD

Deuteranopia (green-blind)

#6881BA

Tritanopia (blue-blind)

#009B9E

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #378fbb;
/* rgb */ color: rgb(55, 143, 187);
/* oklch */ color: oklch(61.7% 0.106 234.1);

Tailwind

colors: {
  custom: {
    50: '#7eafcf',
    500: '#378fbb',
    950: '#000000',
  },
}

SCSS

$custom: #378fbb;
$custom-light: #7eafcf;
$custom-dark: #000000;

JSON

{
  "hex": "#378fbb",
  "rgb": {
    "r": 55,
    "g": 143,
    "b": 187
  },
  "hsl": {
    "h": 200,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.61662,
    "c": 0.10589,
    "h": 234.1
  },
  "luminance": 0.24045
}

Semantic roles & 50–950 ramp

primary

#378FBB

secondary

#C99C85

accent

#7B4ADE

background

#F8FAFC

surface

#EFF4F9

border

#CACED2

text

#0B1014

muted

#7C7F82

Preview Lab

Preview with #378FBB

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

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