#378BBB#378BBB

#378BBB is a mid, moderate cyan. Relative luminance 0.229; OKLCH L 60.7% C 0.108 H 237.5°. Best body text is #000000 at 5.57:1 contrast (WCAG AA passes).

Color values

HEX	#378BBB
RGB	rgb(55, 139, 187)
HSL	hsl(202, 55%, 47%)
HSV	hsv(202, 71%, 73%)
CMYK	cmyk(70.6%, 25.7%, 0%, 26.7%)
CIE-LAB	lab(54.93, -9.47, -32.39)
CIE-LCH	lch(54.93, 33.74, 253.71°)
OKLab	oklab(60.71% -0.058 -0.0912)
OKLCH	oklch(60.71% 0.108 237.5)
XYZ	xyz(19.7743, 22.8631, 50.3749)
Luminance	0.2286 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378BBB #BB6737

analogous

#37BBA9 #378BBB #3749BB

triadic

#378BBB #BB378B #8BBB37

tetradic

#378BBB #A937BB #BB6737 #49BB37

square

#378BBB #A937BB #BB6737 #49BB37

split-complementary

#378BBB #BB3749 #BBA937

monochromatic

#1B455C #29688C #378BBB #5FA7D0 #8EC1DE

Accessibility & contrast

On white

3.77

#378BBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.57

#378BBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378BBB

5.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378BBB	#FFFFFF	#000000	##000000
##378BBB	1.00	3.77	5.57	5.57
#FFFFFF	3.77	1.00	21.00	21.00
#000000	5.57	21.00	1.00	1.00
##000000	5.57	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#748BBD

Deuteranopia (green-blind)

#627EBA

Tritanopia (blue-blind)

#00979B

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #378bbb;
/* rgb */ color: rgb(55, 139, 187);
/* oklch */ color: oklch(60.7% 0.108 237.5);

Tailwind

colors: {
  custom: {
    50: '#7eaccf',
    500: '#378bbb',
    950: '#000000',
  },
}

SCSS

$custom: #378bbb;
$custom-light: #7eaccf;
$custom-dark: #000000;

JSON

{
  "hex": "#378bbb",
  "rgb": {
    "r": 55,
    "g": 139,
    "b": 187
  },
  "hsl": {
    "h": 201.818,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.60708,
    "c": 0.10812,
    "h": 237.5
  },
  "luminance": 0.22865
}

Semantic roles & 50–950 ramp

primary

#378BBB

secondary

#C99E85

accent

#804ADE

background

#F8FAFC

surface

#EFF4F9

border

#CACED2

text

#0B1014

muted

#7C7F82

Preview Lab

Preview with #378BBB

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

Preview Lab → · Contrast checker → · Palette generator →