#3973C9#3973C9

#3973C9 is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.1% C 0.147 H 258.3°. Best body text is #FFFFFF at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#3973C9
RGB	rgb(57, 115, 201)
HSL	hsl(216, 57%, 51%)
HSV	hsv(216, 72%, 79%)
CMYK	cmyk(71.6%, 42.8%, 0%, 21.2%)
CIE-LAB	lab(48.69, 10.17, -50.24)
CIE-LCH	lch(48.69, 51.26, 281.44°)
OKLab	oklab(56.07% -0.0298 -0.1436)
OKLCH	oklch(56.07% 0.147 258.3)
XYZ	xyz(18.3569, 17.3464, 57.6278)
Luminance	0.1735 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3973C9 #C98F39

analogous

#39BBC9 #3973C9 #4739C9

triadic

#3973C9 #C93973 #73C939

tetradic

#3973C9 #C939BB #C98F39 #39C947

square

#3973C9 #C939BB #C98F39 #39C947

split-complementary

#3973C9 #C94739 #BBC939

monochromatic

#1D3C6B #2A579B #3973C9 #6995D6 #99B7E3

Accessibility & contrast

On white

4.70

#3973C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#3973C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3973C9

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3973C9	#FFFFFF	#000000	##FFFFFF
##3973C9	1.00	4.70	4.47	4.70
#FFFFFF	4.70	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#497BCC

Deuteranopia (green-blind)

#306EC7

Tritanopia (blue-blind)

#008794

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3973c9;
/* rgb */ color: rgb(57, 115, 201);
/* oklch */ color: oklch(56.1% 0.147 258.3);

Tailwind

colors: {
  custom: {
    50: '#819ada',
    500: '#3973c9',
    950: '#000000',
  },
}

SCSS

$custom: #3973c9;
$custom-light: #819ada;
$custom-dark: #000000;

JSON

{
  "hex": "#3973c9",
  "rgb": {
    "r": 57,
    "g": 115,
    "b": 201
  },
  "hsl": {
    "h": 215.833,
    "s": 57.143,
    "l": 50.588
  },
  "oklch": {
    "l": 0.56065,
    "c": 0.14669,
    "h": 258.3
  },
  "luminance": 0.17348
}

Semantic roles & 50–950 ramp

primary

#3973C9

secondary

#CFB58F

accent

#A347E0

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3973C9

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

Preview Lab → · Contrast checker → · Palette generator →