#3971C9#3971C9

#3971C9 is a mid, vivid blue. Relative luminance 0.169; OKLCH L 55.6% C 0.149 H 259.2°. Best body text is #FFFFFF at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#3971C9
RGB	rgb(57, 113, 201)
HSL	hsl(217, 57%, 51%)
HSV	hsv(217, 72%, 79%)
CMYK	cmyk(71.6%, 43.8%, 0%, 21.2%)
CIE-LAB	lab(48.13, 11.42, -51.14)
CIE-LCH	lch(48.13, 52.40, 282.58°)
OKLab	oklab(55.63% -0.028 -0.1463)
OKLCH	oklch(55.63% 0.149 259.2)
XYZ	xyz(18.1313, 16.8952, 57.5526)
Luminance	0.1690 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971C9 #C99139

analogous

#39B9C9 #3971C9 #4939C9

triadic

#3971C9 #C93971 #71C939

tetradic

#3971C9 #C939B9 #C99139 #39C949

square

#3971C9 #C939B9 #C99139 #39C949

split-complementary

#3971C9 #C94939 #B9C939

monochromatic

#1D3B6B #2A569B #3971C9 #6993D6 #99B6E3

Accessibility & contrast

On white

4.80

#3971C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.38

#3971C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971C9

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971C9	#FFFFFF	#000000	##FFFFFF
##3971C9	1.00	4.80	4.38	4.80
#FFFFFF	4.80	1.00	21.00	1.00
#000000	4.38	21.00	1.00	21.00
##FFFFFF	4.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4679CC

Deuteranopia (green-blind)

#2B6CC7

Tritanopia (blue-blind)

#008693

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3971c9;
/* rgb */ color: rgb(57, 113, 201);
/* oklch */ color: oklch(55.6% 0.149 259.2);

Tailwind

colors: {
  custom: {
    50: '#8199da',
    500: '#3971c9',
    950: '#000000',
  },
}

SCSS

$custom: #3971c9;
$custom-light: #8199da;
$custom-dark: #000000;

JSON

{
  "hex": "#3971c9",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 201
  },
  "hsl": {
    "h": 216.667,
    "s": 57.143,
    "l": 50.588
  },
  "oklch": {
    "l": 0.55627,
    "c": 0.14897,
    "h": 259.2
  },
  "luminance": 0.16897
}

Semantic roles & 50–950 ramp

primary

#3971C9

secondary

#CFB68F

accent

#A547E0

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3971C9

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

Preview Lab → · Contrast checker → · Palette generator →