#3F77CB#3F77CB

#3F77CB is a mid, vivid blue. Relative luminance 0.186; OKLCH L 57.3% C 0.143 H 258.4°. Best body text is #000000 at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#3F77CB
RGB	rgb(63, 119, 203)
HSL	hsl(216, 57%, 52%)
HSV	hsv(216, 69%, 80%)
CMYK	cmyk(69%, 41.4%, 0%, 20.4%)
CIE-LAB	lab(50.17, 9.29, -49.01)
CIE-LCH	lch(50.17, 49.89, 280.74°)
OKLab	oklab(57.31% -0.0287 -0.1399)
OKLCH	oklch(57.31% 0.143 258.4)
XYZ	xyz(19.4223, 18.5602, 59.0472)
Luminance	0.1856 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F77CB #CB933F

analogous

#3FBDCB #3F77CB #4D3FCB

triadic

#3F77CB #CB3F77 #77CB3F

tetradic

#3F77CB #CB3FBD #CB933F #3FCB4D

square

#3F77CB #CB3FBD #CB933F #3FCB4D

split-complementary

#3F77CB #CB4D3F #BDCB3F

monochromatic

#1F4071 #2C5BA1 #3F77CB #6F99D8 #9FBBE5

Accessibility & contrast

On white

4.46

#3F77CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.71

#3F77CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F77CB

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F77CB	#FFFFFF	#000000	##000000
##3F77CB	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)

#507ECE

Deuteranopia (green-blind)

#3971C9

Tritanopia (blue-blind)

#008A97

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f77cb;
/* rgb */ color: rgb(63, 119, 203);
/* oklch */ color: oklch(57.3% 0.143 258.4);

Tailwind

colors: {
  custom: {
    50: '#849ddb',
    500: '#3f77cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f77cb;
$custom-light: #849ddb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f77cb",
  "rgb": {
    "r": 63,
    "g": 119,
    "b": 203
  },
  "hsl": {
    "h": 216,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.57308,
    "c": 0.14279,
    "h": 258.4
  },
  "luminance": 0.18562
}

Semantic roles & 50–950 ramp

primary

#3F77CB

secondary

#D1B994

accent

#A347E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F77CB

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

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