#3973CB#3973CB

#3973CB is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.2% C 0.149 H 258.6°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#3973CB
RGB	rgb(57, 115, 203)
HSL	hsl(216, 58%, 51%)
HSV	hsv(216, 72%, 80%)
CMYK	cmyk(71.9%, 43.3%, 0%, 20.4%)
CIE-LAB	lab(48.81, 10.90, -51.19)
CIE-LCH	lch(48.81, 52.34, 282.02°)
OKLab	oklab(56.19% -0.0294 -0.1464)
OKLCH	oklch(56.19% 0.149 258.6)
XYZ	xyz(18.5937, 17.4411, 58.8749)
Luminance	0.1744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3973CB #CB9139

analogous

#39BCCB #3973CB #4839CB

triadic

#3973CB #CB3973 #73CB39

tetradic

#3973CB #CB39BC #CB9139 #39CB48

square

#3973CB #CB39BC #CB9139 #39CB48

split-complementary

#3973CB #CB4839 #BCCB39

monochromatic

#1D3D6D #29579D #3973CB #6995D8 #9AB8E4

Accessibility & contrast

On white

4.68

#3973CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.49

#3973CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3973CB

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3973CB	#FFFFFF	#000000	##FFFFFF
##3973CB	1.00	4.68	4.49	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.49	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: #3973cb;
/* rgb */ color: rgb(57, 115, 203);
/* oklch */ color: oklch(56.2% 0.149 258.6);

Tailwind

colors: {
  custom: {
    50: '#819adb',
    500: '#3973cb',
    950: '#000000',
  },
}

SCSS

$custom: #3973cb;
$custom-light: #819adb;
$custom-dark: #000000;

JSON

{
  "hex": "#3973cb",
  "rgb": {
    "r": 57,
    "g": 115,
    "b": 203
  },
  "hsl": {
    "h": 216.164,
    "s": 58.4,
    "l": 50.98
  },
  "oklch": {
    "l": 0.56194,
    "c": 0.14936,
    "h": 258.6
  },
  "luminance": 0.17443
}

Semantic roles & 50–950 ramp

primary

#3973CB

secondary

#D0B790

accent

#A446E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3973CB

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

Preview Lab → · Contrast checker → · Palette generator →