#3971C0#3971C0

#3971C0 is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.1% C 0.137 H 257.4°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#3971C0
RGB	rgb(57, 113, 192)
HSL	hsl(215, 54%, 49%)
HSV	hsv(215, 70%, 75%)
CMYK	cmyk(70.3%, 41.1%, 0%, 24.7%)
CIE-LAB	lab(47.60, 8.13, -46.81)
CIE-LCH	lch(47.60, 47.51, 279.85°)
OKLab	oklab(55.05% -0.0298 -0.1336)
OKLCH	oklch(55.05% 0.137 257.4)
XYZ	xyz(17.1034, 16.4841, 52.1393)
Luminance	0.1649 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971C0 #C08839

analogous

#39B5C0 #3971C0 #4539C0

triadic

#3971C0 #C03971 #71C039

tetradic

#3971C0 #C039B5 #C08839 #39C045

square

#3971C0 #C039B5 #C08839 #39C045

split-complementary

#3971C0 #C04539 #B5C039

monochromatic

#1D3962 #2B5591 #3971C0 #6592D1 #94B3DF

Accessibility & contrast

On white

4.89

#3971C0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#3971C0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971C0

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971C0	#FFFFFF	#000000	##FFFFFF
##3971C0	1.00	4.89	4.30	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C78C3

Deuteranopia (green-blind)

#366BBE

Tritanopia (blue-blind)

#00838F

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3971c0;
/* rgb */ color: rgb(57, 113, 192);
/* oklch */ color: oklch(55.1% 0.137 257.4);

Tailwind

colors: {
  custom: {
    50: '#7f99d3',
    500: '#3971c0',
    950: '#000000',
  },
}

SCSS

$custom: #3971c0;
$custom-light: #7f99d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3971c0",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 192
  },
  "hsl": {
    "h": 215.111,
    "s": 54.217,
    "l": 48.824
  },
  "oklch": {
    "l": 0.55051,
    "c": 0.13688,
    "h": 257.4
  },
  "luminance": 0.16486
}

Semantic roles & 50–950 ramp

primary

#3971C0

secondary

#CBB08A

accent

#A04ADE

background

#F8F9FD

surface

#EFF2FA

border

#CACCD3

text

#0B0D14

muted

#7C7E83

Preview Lab

Preview with #3971C0

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

Preview Lab → · Contrast checker → · Palette generator →