#3F57C7#3F57C7

#3F57C7 is a mid, vivid blue. Relative luminance 0.120; OKLCH L 50.4% C 0.176 H 269.8°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#3F57C7
RGB	rgb(63, 87, 199)
HSL	hsl(229, 55%, 51%)
HSV	hsv(229, 68%, 78%)
CMYK	cmyk(68.3%, 56.3%, 0%, 22%)
CIE-LAB	lab(41.21, 28.12, -61.13)
CIE-LCH	lch(41.21, 67.29, 294.70°)
OKLab	oklab(50.39% -0.0006 -0.176)
OKLCH	oklch(50.39% 0.176 269.8)
XYZ	xyz(15.7634, 11.9952, 55.5063)
Luminance	0.1200 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57C7 #C7AF3F

analogous

#3F9BC7 #3F57C7 #6B3FC7

triadic

#3F57C7 #C73F57 #57C73F

tetradic

#3F57C7 #C73F9B #C7AF3F #3FC76B

square

#3F57C7 #C73F9B #C7AF3F #3FC76B

split-complementary

#3F57C7 #C76B3F #9BC73F

monochromatic

#202D6C #2D419B #3F57C7 #6E80D5 #9EAAE3

Accessibility & contrast

On white

6.18

#3F57C7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#3F57C7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57C7

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57C7	#FFFFFF	#000000	##FFFFFF
##3F57C7	1.00	6.18	3.40	6.18
#FFFFFF	6.18	1.00	21.00	1.00
#000000	3.40	21.00	1.00	21.00
##FFFFFF	6.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CB

Deuteranopia (green-blind)

#005BC5

Tritanopia (blue-blind)

#007286

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3f57c7;
/* rgb */ color: rgb(63, 87, 199);
/* oklch */ color: oklch(50.4% 0.176 269.8);

Tailwind

colors: {
  custom: {
    50: '#8486d9',
    500: '#3f57c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f57c7;
$custom-light: #8486d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57c7",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 199
  },
  "hsl": {
    "h": 229.412,
    "s": 54.839,
    "l": 51.373
  },
  "oklch": {
    "l": 0.5039,
    "c": 0.17601,
    "h": 269.8
  },
  "luminance": 0.11997
}

Semantic roles & 50–950 ramp

primary

#3F57C7

secondary

#CFC493

accent

#C44ADE

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F57C7

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

Preview Lab → · Contrast checker → · Palette generator →