#3F73D1#3F73D1

#3F73D1 is a mid, vivid blue. Relative luminance 0.179; OKLCH L 56.8% C 0.155 H 261.2°. Best body text is #000000 at 4.58:1 contrast (WCAG AA passes).

Color values

HEX	#3F73D1
RGB	rgb(63, 115, 209)
HSL	hsl(219, 61%, 53%)
HSV	hsv(219, 70%, 82%)
CMYK	cmyk(69.9%, 45%, 0%, 18%)
CIE-LAB	lab(49.40, 13.94, -53.66)
CIE-LCH	lch(49.40, 55.44, 284.56°)
OKLab	oklab(56.83% -0.0239 -0.1536)
OKLCH	oklch(56.83% 0.155 261.2)
XYZ	xyz(19.6851, 17.9196, 62.7306)
Luminance	0.1792 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73D1 #D19D3F

analogous

#3FBCD1 #3F73D1 #543FD1

triadic

#3F73D1 #D13F73 #73D13F

tetradic

#3F73D1 #D13FBC #D19D3F #3FD154

square

#3F73D1 #D13FBC #D19D3F #3FD154

split-complementary

#3F73D1 #D1543F #BCD13F

monochromatic

#1D3E79 #2957AA #3F73D1 #7097DD #A2BBE9

Accessibility & contrast

On white

4.58

#3F73D1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#3F73D1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F73D1

4.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73D1	#FFFFFF	#000000	##000000
##3F73D1	1.00	4.58	4.58	4.58
#FFFFFF	4.58	1.00	21.00	21.00
#000000	4.58	21.00	1.00	1.00
##000000	4.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#447DD5

Deuteranopia (green-blind)

#276FCF

Tritanopia (blue-blind)

#008998

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f73d1;
/* rgb */ color: rgb(63, 115, 209);
/* oklch */ color: oklch(56.8% 0.155 261.2);

Tailwind

colors: {
  custom: {
    50: '#859ae0',
    500: '#3f73d1',
    950: '#000000',
  },
}

SCSS

$custom: #3f73d1;
$custom-light: #859ae0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73d1",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 209
  },
  "hsl": {
    "h": 218.63,
    "s": 61.345,
    "l": 53.333
  },
  "oklch": {
    "l": 0.56826,
    "c": 0.15545,
    "h": 261.2
  },
  "luminance": 0.17922
}

Semantic roles & 50–950 ramp

primary

#3F73D1

secondary

#D5BF97

accent

#AB43E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F73D1

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

Preview Lab → · Contrast checker → · Palette generator →