#3973D0#3973D0

#3973D0 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.5% C 0.156 H 259.5°. Best body text is #FFFFFF at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#3973D0
RGB	rgb(57, 115, 208)
HSL	hsl(217, 62%, 52%)
HSV	hsv(217, 73%, 82%)
CMYK	cmyk(72.6%, 44.7%, 0%, 18.4%)
CIE-LAB	lab(49.11, 12.73, -53.57)
CIE-LCH	lch(49.11, 55.06, 283.36°)
OKLab	oklab(56.52% -0.0285 -0.1534)
OKLCH	oklch(56.52% 0.156 259.5)
XYZ	xyz(19.1991, 17.6833, 62.0637)
Luminance	0.1769 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3973D0 #D09639

analogous

#39BED0 #3973D0 #4B39D0

triadic

#3973D0 #D03973 #73D039

tetradic

#3973D0 #D039BE #D09639 #39D04B

square

#3973D0 #D039BE #D09639 #39D04B

split-complementary

#3973D0 #D04B39 #BED039

monochromatic

#1B3D73 #2757A5 #3973D0 #6A96DC #9CB9E7

Accessibility & contrast

On white

4.63

#3973D0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.54

#3973D0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3973D0

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3973D0	#FFFFFF	#000000	##FFFFFF
##3973D0	1.00	4.63	4.54	4.63
#FFFFFF	4.63	1.00	21.00	1.00
#000000	4.54	21.00	1.00	21.00
##FFFFFF	4.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#447CD4

Deuteranopia (green-blind)

#256ECE

Tritanopia (blue-blind)

#008997

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3973d0;
/* rgb */ color: rgb(57, 115, 208);
/* oklch */ color: oklch(56.5% 0.156 259.5);

Tailwind

colors: {
  custom: {
    50: '#829adf',
    500: '#3973d0',
    950: '#000000',
  },
}

SCSS

$custom: #3973d0;
$custom-light: #829adf;
$custom-dark: #000000;

JSON

{
  "hex": "#3973d0",
  "rgb": {
    "r": 57,
    "g": 115,
    "b": 208
  },
  "hsl": {
    "h": 216.954,
    "s": 61.633,
    "l": 51.961
  },
  "oklch": {
    "l": 0.56521,
    "c": 0.15604,
    "h": 259.5
  },
  "luminance": 0.17685
}

Semantic roles & 50–950 ramp

primary

#3973D0

secondary

#D3BA91

accent

#A743E5

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3973D0

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

Preview Lab → · Contrast checker → · Palette generator →