#3F73DD#3F73DD

#3F73DD is a mid, vivid blue. Relative luminance 0.185; OKLCH L 57.6% C 0.172 H 262.6°. Best body text is #000000 at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#3F73DD
RGB	rgb(63, 115, 221)
HSL	hsl(220, 70%, 56%)
HSV	hsv(220, 71%, 87%)
CMYK	cmyk(71.5%, 48%, 0%, 13.3%)
CIE-LAB	lab(50.14, 18.27, -59.28)
CIE-LCH	lch(50.14, 62.03, 287.13°)
OKLab	oklab(57.63% -0.022 -0.1701)
OKLCH	oklch(57.63% 0.172 262.6)
XYZ	xyz(21.2271, 18.5364, 70.8518)
Luminance	0.1854 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73DD #DDA93F

analogous

#3FC2DD #3F73DD #5A3FDD

triadic

#3F73DD #DD3F73 #73DD3F

tetradic

#3F73DD #DD3FC2 #DDA93F #3FDD5A

square

#3F73DD #DD3FC2 #DDA93F #3FDD5A

split-complementary

#3F73DD #DD5A3F #C2DD3F

monochromatic

#183D89 #2255BD #3F73DD #7399E6 #A7BFEF

Accessibility & contrast

On white

4.46

#3F73DD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.71

#3F73DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F73DD

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73DD	#FFFFFF	#000000	##000000
##3F73DD	1.00	4.46	4.71	4.71
#FFFFFF	4.46	1.00	21.00	21.00
#000000	4.71	21.00	1.00	1.00
##000000	4.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#387FE1

Deuteranopia (green-blind)

#0370DB

Tritanopia (blue-blind)

#008C9D

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f73dd;
/* rgb */ color: rgb(63, 115, 221);
/* oklch */ color: oklch(57.6% 0.172 262.6);

Tailwind

colors: {
  custom: {
    50: '#879ae8',
    500: '#3f73dd',
    950: '#000000',
  },
}

SCSS

$custom: #3f73dd;
$custom-light: #879ae8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73dd",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 221
  },
  "hsl": {
    "h": 220.253,
    "s": 69.912,
    "l": 55.686
  },
  "oklch": {
    "l": 0.57634,
    "c": 0.17154,
    "h": 262.6
  },
  "luminance": 0.18539
}

Semantic roles & 50–950 ramp

primary

#3F73DD

secondary

#DDC79B

accent

#B23BED

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #3F73DD

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

Preview Lab → · Contrast checker → · Palette generator →