#3971CB#3971CB

#3971CB is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.8% C 0.152 H 259.5°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#3971CB
RGB	rgb(57, 113, 203)
HSL	hsl(217, 58%, 51%)
HSV	hsv(217, 72%, 80%)
CMYK	cmyk(71.9%, 44.3%, 0%, 20.4%)
CIE-LAB	lab(48.25, 12.15, -52.10)
CIE-LCH	lch(48.25, 53.49, 283.13°)
OKLab	oklab(55.76% -0.0276 -0.1491)
OKLCH	oklch(55.76% 0.152 259.5)
XYZ	xyz(18.3681, 16.9899, 58.7997)
Luminance	0.1699 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971CB #CB9339

analogous

#39BACB #3971CB #4A39CB

triadic

#3971CB #CB3971 #71CB39

tetradic

#3971CB #CB39BA #CB9339 #39CB4A

square

#3971CB #CB39BA #CB9339 #39CB4A

split-complementary

#3971CB #CB4A39 #BACB39

monochromatic

#1D3B6D #29569D #3971CB #6994D8 #9AB7E4

Accessibility & contrast

On white

4.77

#3971CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#3971CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971CB

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971CB	#FFFFFF	#000000	##FFFFFF
##3971CB	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#447ACE

Deuteranopia (green-blind)

#286CC9

Tritanopia (blue-blind)

#008694

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3971cb;
/* rgb */ color: rgb(57, 113, 203);
/* oklch */ color: oklch(55.8% 0.152 259.5);

Tailwind

colors: {
  custom: {
    50: '#8199db',
    500: '#3971cb',
    950: '#000000',
  },
}

SCSS

$custom: #3971cb;
$custom-light: #8199db;
$custom-dark: #000000;

JSON

{
  "hex": "#3971cb",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 203
  },
  "hsl": {
    "h": 216.986,
    "s": 58.4,
    "l": 50.98
  },
  "oklch": {
    "l": 0.55758,
    "c": 0.15167,
    "h": 259.5
  },
  "luminance": 0.16992
}

Semantic roles & 50–950 ramp

primary

#3971CB

secondary

#D0B790

accent

#A646E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3971CB

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

Preview Lab → · Contrast checker → · Palette generator →