#3971D7#3971D7

#3971D7 is a mid, vivid blue. Relative luminance 0.176; OKLCH L 56.6% C 0.168 H 261.2°. Best body text is #FFFFFF at 4.65:1 contrast (WCAG AA passes).

Color values

HEX	#3971D7
RGB	rgb(57, 113, 215)
HSL	hsl(219, 66%, 53%)
HSV	hsv(219, 73%, 84%)
CMYK	cmyk(73.5%, 47.4%, 0%, 15.7%)
CIE-LAB	lab(48.99, 16.55, -57.75)
CIE-LCH	lch(48.99, 60.07, 285.99°)
OKLab	oklab(56.57% -0.0256 -0.1657)
OKLCH	oklch(56.57% 0.168 261.2)
XYZ	xyz(19.8538, 17.5842, 66.6245)
Luminance	0.1759 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971D7 #D79F39

analogous

#39C0D7 #3971D7 #5039D7

triadic

#3971D7 #D73971 #71D739

tetradic

#3971D7 #D739C0 #D79F39 #39D750

square

#3971D7 #D739C0 #D79F39 #39D750

split-complementary

#3971D7 #D75039 #C0D739

monochromatic

#193C7C #2355AF #3971D7 #6C96E1 #9FBAEC

Accessibility & contrast

On white

4.65

#3971D7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.52

#3971D7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3971D7

4.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971D7	#FFFFFF	#000000	##FFFFFF
##3971D7	1.00	4.65	4.52	4.65
#FFFFFF	4.65	1.00	21.00	1.00
#000000	4.52	21.00	1.00	21.00
##FFFFFF	4.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#397CDB

Deuteranopia (green-blind)

#076ED5

Tritanopia (blue-blind)

#00899A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3971d7;
/* rgb */ color: rgb(57, 113, 215);
/* oklch */ color: oklch(56.6% 0.168 261.2);

Tailwind

colors: {
  custom: {
    50: '#8499e4',
    500: '#3971d7',
    950: '#000000',
  },
}

SCSS

$custom: #3971d7;
$custom-light: #8499e4;
$custom-dark: #000000;

JSON

{
  "hex": "#3971d7",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 215
  },
  "hsl": {
    "h": 218.734,
    "s": 66.387,
    "l": 53.333
  },
  "oklch": {
    "l": 0.56566,
    "c": 0.16771,
    "h": 261.2
  },
  "luminance": 0.17586
}

Semantic roles & 50–950 ramp

primary

#3971D7

secondary

#D8C094

accent

#AD3EE9

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0D16

muted

#7D7E84

Preview Lab

Preview with #3971D7

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

Preview Lab → · Contrast checker → · Palette generator →