#3F75CB#3F75CB

#3F75CB is a mid, vivid blue. Relative luminance 0.181; OKLCH L 56.9% C 0.145 H 259.3°. Best body text is #000000 at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#3F75CB
RGB	rgb(63, 117, 203)
HSL	hsl(217, 57%, 52%)
HSV	hsv(217, 69%, 80%)
CMYK	cmyk(69%, 42.4%, 0%, 20.4%)
CIE-LAB	lab(49.60, 10.53, -49.91)
CIE-LCH	lch(49.60, 51.01, 281.92°)
OKLab	oklab(56.87% -0.0268 -0.1425)
OKLCH	oklch(56.87% 0.145 259.3)
XYZ	xyz(19.1868, 18.0892, 58.9687)
Luminance	0.1809 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F75CB #CB953F

analogous

#3FBBCB #3F75CB #4F3FCB

triadic

#3F75CB #CB3F75 #75CB3F

tetradic

#3F75CB #CB3FBB #CB953F #3FCB4F

square

#3F75CB #CB3FBB #CB953F #3FCB4F

split-complementary

#3F75CB #CB4F3F #BBCB3F

monochromatic

#1F3E71 #2C59A1 #3F75CB #6F98D8 #9FBAE5

Accessibility & contrast

On white

4.55

#3F75CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.62

#3F75CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F75CB

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F75CB	#FFFFFF	#000000	##000000
##3F75CB	1.00	4.55	4.62	4.62
#FFFFFF	4.55	1.00	21.00	21.00
#000000	4.62	21.00	1.00	1.00
##000000	4.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C7DCE

Deuteranopia (green-blind)

#3570C9

Tritanopia (blue-blind)

#008996

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #3f75cb;
/* rgb */ color: rgb(63, 117, 203);
/* oklch */ color: oklch(56.9% 0.145 259.3);

Tailwind

colors: {
  custom: {
    50: '#849cdb',
    500: '#3f75cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f75cb;
$custom-light: #849cdb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f75cb",
  "rgb": {
    "r": 63,
    "g": 117,
    "b": 203
  },
  "hsl": {
    "h": 216.857,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.56871,
    "c": 0.14505,
    "h": 259.3
  },
  "luminance": 0.18091
}

Semantic roles & 50–950 ramp

primary

#3F75CB

secondary

#D1BA94

accent

#A547E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F75CB

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

Preview Lab → · Contrast checker → · Palette generator →