#3F79CB#3F79CB

#3F79CB is a mid, vivid blue. Relative luminance 0.190; OKLCH L 57.7% C 0.141 H 257.4°. Best body text is #000000 at 4.81:1 contrast (WCAG AA passes).

Color values

HEX	#3F79CB
RGB	rgb(63, 121, 203)
HSL	hsl(215, 57%, 52%)
HSV	hsv(215, 69%, 80%)
CMYK	cmyk(69%, 40.4%, 0%, 20.4%)
CIE-LAB	lab(50.74, 8.06, -48.11)
CIE-LCH	lch(50.74, 48.78, 279.51°)
OKLab	oklab(57.75% -0.0306 -0.1372)
OKLCH	oklch(57.75% 0.141 257.4)
XYZ	xyz(19.6629, 19.0413, 59.1274)
Luminance	0.1904 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F79CB #CB913F

analogous

#3FBFCB #3F79CB #4B3FCB

triadic

#3F79CB #CB3F79 #79CB3F

tetradic

#3F79CB #CB3FBF #CB913F #3FCB4B

square

#3F79CB #CB3FBF #CB913F #3FCB4B

split-complementary

#3F79CB #CB4B3F #BFCB3F

monochromatic

#1F4171 #2C5CA1 #3F79CB #6F9BD8 #9FBCE5

Accessibility & contrast

On white

4.37

#3F79CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.81

#3F79CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F79CB

4.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F79CB	#FFFFFF	#000000	##000000
##3F79CB	1.00	4.37	4.81	4.81
#FFFFFF	4.37	1.00	21.00	21.00
#000000	4.81	21.00	1.00	1.00
##000000	4.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5380CE

Deuteranopia (green-blind)

#3D73C9

Tritanopia (blue-blind)

#008C98

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3f79cb;
/* rgb */ color: rgb(63, 121, 203);
/* oklch */ color: oklch(57.7% 0.141 257.4);

Tailwind

colors: {
  custom: {
    50: '#849fdb',
    500: '#3f79cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f79cb;
$custom-light: #849fdb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f79cb",
  "rgb": {
    "r": 63,
    "g": 121,
    "b": 203
  },
  "hsl": {
    "h": 215.143,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.57747,
    "c": 0.14056,
    "h": 257.4
  },
  "luminance": 0.19043
}

Semantic roles & 50–950 ramp

primary

#3F79CB

secondary

#D1B894

accent

#A147E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F79CB

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

Preview Lab → · Contrast checker → · Palette generator →