#3F73DB#3F73DB

#3F73DB is a mid, vivid blue. Relative luminance 0.184; OKLCH L 57.5% C 0.169 H 262.4°. Best body text is #000000 at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#3F73DB
RGB	rgb(63, 115, 219)
HSL	hsl(220, 68%, 55%)
HSV	hsv(220, 71%, 86%)
CMYK	cmyk(71.2%, 47.5%, 0%, 14.1%)
CIE-LAB	lab(50.01, 17.55, -58.35)
CIE-LCH	lch(50.01, 60.93, 286.74°)
OKLab	oklab(57.5% -0.0223 -0.1674)
OKLCH	oklch(57.5% 0.169 262.4)
XYZ	xyz(20.9623, 18.4305, 69.4568)
Luminance	0.1843 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73DB #DBA73F

analogous

#3FC1DB #3F73DB #593FDB

triadic

#3F73DB #DB3F73 #73DB3F

tetradic

#3F73DB #DB3FC1 #DBA73F #3FDB59

square

#3F73DB #DB3FC1 #DBA73F #3FDB59

split-complementary

#3F73DB #DB593F #C1DB3F

monochromatic

#193E86 #2355BA #3F73DB #7399E5 #A6BEEE

Accessibility & contrast

On white

4.48

#3F73DB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.69

#3F73DB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F73DB

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73DB	#FFFFFF	#000000	##000000
##3F73DB	1.00	4.48	4.69	4.69
#FFFFFF	4.48	1.00	21.00	21.00
#000000	4.69	21.00	1.00	1.00
##000000	4.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A7FDF

Deuteranopia (green-blind)

#0E70D9

Tritanopia (blue-blind)

#008C9C

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f73db;
/* rgb */ color: rgb(63, 115, 219);
/* oklch */ color: oklch(57.5% 0.169 262.4);

Tailwind

colors: {
  custom: {
    50: '#879ae7',
    500: '#3f73db',
    950: '#000000',
  },
}

SCSS

$custom: #3f73db;
$custom-light: #879ae7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73db",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 219
  },
  "hsl": {
    "h": 220,
    "s": 68.421,
    "l": 55.294
  },
  "oklch": {
    "l": 0.57497,
    "c": 0.16887,
    "h": 262.4
  },
  "luminance": 0.18433
}

Semantic roles & 50–950 ramp

primary

#3F73DB

secondary

#DCC69A

accent

#B13DEB

background

#F9F9FE

surface

#F1F2FC

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #3F73DB

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

Preview Lab → · Contrast checker → · Palette generator →