#3971D0#3971D0

#3971D0 is a mid, vivid blue. Relative luminance 0.172; OKLCH L 56.1% C 0.158 H 260.3°. Best body text is #FFFFFF at 4.72:1 contrast (WCAG AA passes).

Color values

HEX	#3971D0
RGB	rgb(57, 113, 208)
HSL	hsl(218, 62%, 52%)
HSV	hsv(218, 73%, 82%)
CMYK	cmyk(72.6%, 45.7%, 0%, 18.4%)
CIE-LAB	lab(48.55, 13.98, -54.47)
CIE-LCH	lch(48.55, 56.23, 284.40°)
OKLab	oklab(56.09% -0.0267 -0.1561)
OKLCH	oklch(56.09% 0.158 260.3)
XYZ	xyz(18.9735, 17.2321, 61.9885)
Luminance	0.1723 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971D0 #D09839

analogous

#39BDD0 #3971D0 #4C39D0

triadic

#3971D0 #D03971 #71D039

tetradic

#3971D0 #D039BD #D09839 #39D04C

square

#3971D0 #D039BD #D09839 #39D04C

split-complementary

#3971D0 #D04C39 #BDD039

monochromatic

#1B3C73 #2756A5 #3971D0 #6A94DC #9CB8E7

Accessibility & contrast

On white

4.72

#3971D0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.45

#3971D0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971D0

4.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971D0	#FFFFFF	#000000	##FFFFFF
##3971D0	1.00	4.72	4.45	4.72
#FFFFFF	4.72	1.00	21.00	1.00
#000000	4.45	21.00	1.00	21.00
##FFFFFF	4.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#407BD4

Deuteranopia (green-blind)

#1F6DCE

Tritanopia (blue-blind)

#008796

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3971d0;
/* rgb */ color: rgb(57, 113, 208);
/* oklch */ color: oklch(56.1% 0.158 260.3);

Tailwind

colors: {
  custom: {
    50: '#8299df',
    500: '#3971d0',
    950: '#000000',
  },
}

SCSS

$custom: #3971d0;
$custom-light: #8299df;
$custom-dark: #000000;

JSON

{
  "hex": "#3971d0",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 208
  },
  "hsl": {
    "h": 217.748,
    "s": 61.633,
    "l": 51.961
  },
  "oklch": {
    "l": 0.5609,
    "c": 0.15837,
    "h": 260.3
  },
  "luminance": 0.17234
}

Semantic roles & 50–950 ramp

primary

#3971D0

secondary

#D3BB91

accent

#A943E5

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3971D0

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

Preview Lab → · Contrast checker → · Palette generator →