#378AD3#378AD3

#378AD3 is a mid, vivid cyan. Relative luminance 0.237; OKLCH L 61.7% C 0.136 H 248.6°. Best body text is #000000 at 5.74:1 contrast (WCAG AA passes).

Color values

HEX	#378AD3
RGB	rgb(55, 138, 211)
HSL	hsl(208, 64%, 52%)
HSV	hsv(208, 74%, 83%)
CMYK	cmyk(73.9%, 34.6%, 0%, 17.3%)
CIE-LAB	lab(55.78, -0.45, -44.66)
CIE-LCH	lch(55.78, 44.66, 269.42°)
OKLab	oklab(61.75% -0.0497 -0.1269)
OKLCH	oklch(61.75% 0.136 248.6)
XYZ	xyz(22.4174, 23.6898, 65.0065)
Luminance	0.2369 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#378AD3 #D38037

analogous

#37D3CE #378AD3 #373CD3

triadic

#378AD3 #D3378A #8AD337

tetradic

#378AD3 #CE37D3 #D38037 #3CD337

square

#378AD3 #CE37D3 #D38037 #3CD337

split-complementary

#378AD3 #D3373C #D3CE37

monochromatic

#1A4B76 #256BA8 #378AD3 #69A7DE #9BC5E9

Accessibility & contrast

On white

3.66

#378AD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.74

#378AD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #378AD3

5.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##378AD3	#FFFFFF	#000000	##000000
##378AD3	1.00	3.66	5.74	5.74
#FFFFFF	3.66	1.00	21.00	21.00
#000000	5.74	21.00	1.00	1.00
##000000	5.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#698ED6

Deuteranopia (green-blind)

#527FD2

Tritanopia (blue-blind)

#009BA5

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #378ad3;
/* rgb */ color: rgb(55, 138, 211);
/* oklch */ color: oklch(61.7% 0.136 248.6);

Tailwind

colors: {
  custom: {
    50: '#82abe1',
    500: '#378ad3',
    950: '#000000',
  },
}

SCSS

$custom: #378ad3;
$custom-light: #82abe1;
$custom-dark: #000000;

JSON

{
  "hex": "#378ad3",
  "rgb": {
    "r": 55,
    "g": 138,
    "b": 211
  },
  "hsl": {
    "h": 208.077,
    "s": 63.934,
    "l": 52.157
  },
  "oklch": {
    "l": 0.61749,
    "c": 0.13632,
    "h": 248.6
  },
  "luminance": 0.23692
}

Semantic roles & 50–950 ramp

primary

#378AD3

secondary

#D5B191

accent

#8F41E7

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #378AD3

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

Preview Lab → · Contrast checker → · Palette generator →