#3873CB#3873CB

#3873CB is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.2% C 0.150 H 258.4°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#3873CB
RGB	rgb(56, 115, 203)
HSL	hsl(216, 59%, 51%)
HSV	hsv(216, 72%, 80%)
CMYK	cmyk(72.4%, 43.3%, 0%, 20.4%)
CIE-LAB	lab(48.77, 10.76, -51.25)
CIE-LCH	lch(48.77, 52.37, 281.85°)
OKLab	oklab(56.16% -0.0301 -0.1466)
OKLCH	oklch(56.16% 0.15 258.4)
XYZ	xyz(18.5372, 17.4120, 58.8722)
Luminance	0.1741 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3873CB #CB9038

analogous

#38BDCB #3873CB #4638CB

triadic

#3873CB #CB3873 #73CB38

tetradic

#3873CB #CB38BD #CB9038 #38CB46

square

#3873CB #CB38BD #CB9038 #38CB46

split-complementary

#3873CB #CB4638 #BDCB38

monochromatic

#1C3C6C #29579D #3873CB #6995D8 #99B7E4

Accessibility & contrast

On white

4.68

#3873CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#3873CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3873CB

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3873CB	#FFFFFF	#000000	##FFFFFF
##3873CB	1.00	4.68	4.48	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#487BCE

Deuteranopia (green-blind)

#2D6EC9

Tritanopia (blue-blind)

#008895

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3873cb;
/* rgb */ color: rgb(56, 115, 203);
/* oklch */ color: oklch(56.2% 0.150 258.4);

Tailwind

colors: {
  custom: {
    50: '#819adb',
    500: '#3873cb',
    950: '#000000',
  },
}

SCSS

$custom: #3873cb;
$custom-light: #819adb;
$custom-dark: #000000;

JSON

{
  "hex": "#3873cb",
  "rgb": {
    "r": 56,
    "g": 115,
    "b": 203
  },
  "hsl": {
    "h": 215.918,
    "s": 58.566,
    "l": 50.784
  },
  "oklch": {
    "l": 0.56156,
    "c": 0.14969,
    "h": 258.4
  },
  "luminance": 0.17414
}

Semantic roles & 50–950 ramp

primary

#3873CB

secondary

#D0B68F

accent

#A346E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3873CB

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

Preview Lab → · Contrast checker → · Palette generator →