#3F57CB#3F57CB

#3F57CB is a mid, vivid blue. Relative luminance 0.122; OKLCH L 50.7% C 0.181 H 269.9°. Best body text is #FFFFFF at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#3F57CB
RGB	rgb(63, 87, 203)
HSL	hsl(230, 57%, 52%)
HSV	hsv(230, 69%, 80%)
CMYK	cmyk(69%, 57.1%, 0%, 20.4%)
CIE-LAB	lab(41.51, 29.54, -62.96)
CIE-LCH	lch(41.51, 69.55, 295.14°)
OKLab	oklab(50.71% -0.0004 -0.1814)
OKLCH	oklch(50.71% 0.181 269.9)
XYZ	xyz(16.2339, 12.1834, 57.9844)
Luminance	0.1218 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57CB #CBB33F

analogous

#3F9DCB #3F57CB #6D3FCB

triadic

#3F57CB #CB3F57 #57CB3F

tetradic

#3F57CB #CB3F9D #CBB33F #3FCB6D

square

#3F57CB #CB3F9D #CBB33F #3FCB6D

split-complementary

#3F57CB #CB6D3F #9DCB3F

monochromatic

#1F2D71 #2C40A1 #3F57CB #6F81D8 #9FABE5

Accessibility & contrast

On white

6.11

#3F57CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#3F57CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57CB

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57CB	#FFFFFF	#000000	##FFFFFF
##3F57CB	1.00	6.11	3.44	6.11
#FFFFFF	6.11	1.00	21.00	1.00
#000000	3.44	21.00	1.00	21.00
##FFFFFF	6.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0069CF

Deuteranopia (green-blind)

#005CC9

Tritanopia (blue-blind)

#007388

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #3f57cb;
/* rgb */ color: rgb(63, 87, 203);
/* oklch */ color: oklch(50.7% 0.181 269.9);

Tailwind

colors: {
  custom: {
    50: '#8586dc',
    500: '#3f57cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f57cb;
$custom-light: #8586dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57cb",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 203
  },
  "hsl": {
    "h": 229.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.50706,
    "c": 0.18139,
    "h": 269.9
  },
  "luminance": 0.12185
}

Semantic roles & 50–950 ramp

primary

#3F57CB

secondary

#D1C794

accent

#C647E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F57CB

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

Preview Lab → · Contrast checker → · Palette generator →