#378EB3#378EB3

#378EB3 is a mid, moderate cyan. Relative luminance 0.234; OKLCH L 61.0% C 0.099 H 229.8°. Best body text is #000000 at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#378EB3
RGB	rgb(55, 142, 179)
HSL	hsl(198, 53%, 46%)
HSV	hsv(198, 69%, 70%)
CMYK	cmyk(69.3%, 20.7%, 0%, 29.8%)
CIE-LAB	lab(55.49, -13.86, -26.95)
CIE-LCH	lch(55.49, 30.31, 242.79°)
OKLab	oklab(61.04% -0.0639 -0.0756)
OKLCH	oklch(61.04% 0.099 229.8)
XYZ	xyz(19.3820, 23.4108, 46.1363)
Luminance	0.2341 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378EB3 #B35C37

analogous

#37B39A #378EB3 #3750B3

triadic

#378EB3 #B3378E #8EB337

tetradic

#378EB3 #9A37B3 #B35C37 #50B337

square

#378EB3 #9A37B3 #B35C37 #50B337

split-complementary

#378EB3 #B33750 #B39A37

monochromatic

#1A4455 #296984 #378EB3 #5BABCD #8AC3DB

Accessibility & contrast

On white

3.70

#378EB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.68

#378EB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378EB3

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378EB3	#FFFFFF	#000000	##000000
##378EB3	1.00	3.70	5.68	5.68
#FFFFFF	3.70	1.00	21.00	21.00
#000000	5.68	21.00	1.00	1.00
##000000	5.68	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7B8CB5

Deuteranopia (green-blind)

#6A7FB2

Tritanopia (blue-blind)

#00989A

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #378eb3;
/* rgb */ color: rgb(55, 142, 179);
/* oklch */ color: oklch(61.0% 0.099 229.8);

Tailwind

colors: {
  custom: {
    50: '#7dafca',
    500: '#378eb3',
    950: '#000000',
  },
}

SCSS

$custom: #378eb3;
$custom-light: #7dafca;
$custom-dark: #000000;

JSON

{
  "hex": "#378eb3",
  "rgb": {
    "r": 55,
    "g": 142,
    "b": 179
  },
  "hsl": {
    "h": 197.903,
    "s": 52.991,
    "l": 45.882
  },
  "oklch": {
    "l": 0.61042,
    "c": 0.09896,
    "h": 229.8
  },
  "luminance": 0.23413
}

Semantic roles & 50–950 ramp

primary

#378EB3

secondary

#C59581

accent

#774BDC

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #378EB3

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

Preview Lab → · Contrast checker → · Palette generator →