#3973CF#3973CF

#3973CF is a mid, vivid blue. Relative luminance 0.176; OKLCH L 56.5% C 0.155 H 259.3°. Best body text is #FFFFFF at 4.64:1 contrast (WCAG AA passes).

Color values

HEX	#3973CF
RGB	rgb(57, 115, 207)
HSL	hsl(217, 61%, 52%)
HSV	hsv(217, 72%, 81%)
CMYK	cmyk(72.5%, 44.4%, 0%, 18.8%)
CIE-LAB	lab(49.05, 12.36, -53.10)
CIE-LCH	lch(49.05, 54.52, 283.10°)
OKLab	oklab(56.46% -0.0287 -0.152)
OKLCH	oklch(56.46% 0.155 259.3)
XYZ	xyz(19.0765, 17.6342, 61.4178)
Luminance	0.1764 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3973CF #CF9539

analogous

#39BECF #3973CF #4A39CF

triadic

#3973CF #CF3973 #73CF39

tetradic

#3973CF #CF39BE #CF9539 #39CF4A

square

#3973CF #CF39BE #CF9539 #39CF4A

split-complementary

#3973CF #CF4A39 #BECF39

monochromatic

#1C3D72 #2857A3 #3973CF #6A96DB #9CB9E7

Accessibility & contrast

On white

4.64

#3973CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#3973CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3973CF

4.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3973CF	#FFFFFF	#000000	##FFFFFF
##3973CF	1.00	4.64	4.53	4.64
#FFFFFF	4.64	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#457CD3

Deuteranopia (green-blind)

#276ECD

Tritanopia (blue-blind)

#008997

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3973cf;
/* rgb */ color: rgb(57, 115, 207);
/* oklch */ color: oklch(56.5% 0.155 259.3);

Tailwind

colors: {
  custom: {
    50: '#829ade',
    500: '#3973cf',
    950: '#000000',
  },
}

SCSS

$custom: #3973cf;
$custom-light: #829ade;
$custom-dark: #000000;

JSON

{
  "hex": "#3973cf",
  "rgb": {
    "r": 57,
    "g": 115,
    "b": 207
  },
  "hsl": {
    "h": 216.8,
    "s": 60.976,
    "l": 51.765
  },
  "oklch": {
    "l": 0.56455,
    "c": 0.15471,
    "h": 259.3
  },
  "luminance": 0.17636
}

Semantic roles & 50–950 ramp

primary

#3973CF

secondary

#D3B991

accent

#A644E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3973CF

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

Preview Lab → · Contrast checker → · Palette generator →