#3F57C8#3F57C8

#3F57C8 is a mid, vivid blue. Relative luminance 0.120; OKLCH L 50.5% C 0.177 H 269.8°. Best body text is #FFFFFF at 6.16:1 contrast (WCAG AA passes).

Color values

HEX	#3F57C8
RGB	rgb(63, 87, 200)
HSL	hsl(229, 55%, 52%)
HSV	hsv(229, 69%, 78%)
CMYK	cmyk(68.5%, 56.5%, 0%, 21.6%)
CIE-LAB	lab(41.28, 28.48, -61.59)
CIE-LCH	lch(41.28, 67.86, 294.81°)
OKLab	oklab(50.47% -0.0005 -0.1774)
OKLCH	oklch(50.47% 0.177 269.8)
XYZ	xyz(15.8799, 12.0417, 56.1198)
Luminance	0.1204 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57C8 #C8B03F

analogous

#3F9CC8 #3F57C8 #6C3FC8

triadic

#3F57C8 #C83F57 #57C83F

tetradic

#3F57C8 #C83F9C #C8B03F #3FC86C

square

#3F57C8 #C83F9C #C8B03F #3FC86C

split-complementary

#3F57C8 #C86C3F #9CC83F

monochromatic

#1F2D6D #2D419D #3F57C8 #6F81D6 #9EAAE3

Accessibility & contrast

On white

6.16

#3F57C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.41

#3F57C8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57C8

6.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57C8	#FFFFFF	#000000	##FFFFFF
##3F57C8	1.00	6.16	3.41	6.16
#FFFFFF	6.16	1.00	21.00	1.00
#000000	3.41	21.00	1.00	21.00
##FFFFFF	6.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CC

Deuteranopia (green-blind)

#005BC6

Tritanopia (blue-blind)

#007387

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3f57c8;
/* rgb */ color: rgb(63, 87, 200);
/* oklch */ color: oklch(50.5% 0.177 269.8);

Tailwind

colors: {
  custom: {
    50: '#8486da',
    500: '#3f57c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f57c8;
$custom-light: #8486da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57c8",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 200
  },
  "hsl": {
    "h": 229.489,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.50468,
    "c": 0.17736,
    "h": 269.8
  },
  "luminance": 0.12043
}

Semantic roles & 50–950 ramp

primary

#3F57C8

secondary

#D0C593

accent

#C549DF

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F57C8

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

Preview Lab → · Contrast checker → · Palette generator →