#3971CD#3971CD

#3971CD is a mid, vivid blue. Relative luminance 0.171; OKLCH L 55.9% C 0.154 H 259.8°. Best body text is #FFFFFF at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#3971CD
RGB	rgb(57, 113, 205)
HSL	hsl(217, 60%, 51%)
HSV	hsv(217, 72%, 80%)
CMYK	cmyk(72.2%, 44.9%, 0%, 19.6%)
CIE-LAB	lab(48.37, 12.88, -53.05)
CIE-LCH	lch(48.37, 54.59, 283.65°)
OKLab	oklab(55.89% -0.0273 -0.1519)
OKLCH	oklch(55.89% 0.154 259.8)
XYZ	xyz(18.6079, 17.0859, 60.0630)
Luminance	0.1709 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971CD #CD9539

analogous

#39BBCD #3971CD #4B39CD

triadic

#3971CD #CD3971 #71CD39

tetradic

#3971CD #CD39BB #CD9539 #39CD4B

square

#3971CD #CD39BB #CD9539 #39CD4B

split-complementary

#3971CD #CD4B39 #BBCD39

monochromatic

#1C3C6F #2856A0 #3971CD #6A94D9 #9BB7E6

Accessibility & contrast

On white

4.75

#3971CD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.42

#3971CD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971CD

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971CD	#FFFFFF	#000000	##FFFFFF
##3971CD	1.00	4.75	4.42	4.75
#FFFFFF	4.75	1.00	21.00	1.00
#000000	4.42	21.00	1.00	21.00
##FFFFFF	4.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#427AD0

Deuteranopia (green-blind)

#246DCB

Tritanopia (blue-blind)

#008795

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3971cd;
/* rgb */ color: rgb(57, 113, 205);
/* oklch */ color: oklch(55.9% 0.154 259.8);

Tailwind

colors: {
  custom: {
    50: '#8299dd',
    500: '#3971cd',
    950: '#000000',
  },
}

SCSS

$custom: #3971cd;
$custom-light: #8299dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3971cd",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 205
  },
  "hsl": {
    "h": 217.297,
    "s": 59.677,
    "l": 51.373
  },
  "oklch": {
    "l": 0.5589,
    "c": 0.15435,
    "h": 259.8
  },
  "luminance": 0.17088
}

Semantic roles & 50–950 ramp

primary

#3971CD

secondary

#D2B990

accent

#A745E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3971CD

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

Preview Lab → · Contrast checker → · Palette generator →