#3F57D0#3F57D0

#3F57D0 is a mid, vivid blue. Relative luminance 0.124; OKLCH L 51.1% C 0.188 H 269.9°. Best body text is #FFFFFF at 6.03:1 contrast (WCAG AA passes).

Color values

HEX	#3F57D0
RGB	rgb(63, 87, 208)
HSL	hsl(230, 61%, 53%)
HSV	hsv(230, 70%, 82%)
CMYK	cmyk(69.7%, 58.2%, 0%, 18.4%)
CIE-LAB	lab(41.88, 31.32, -65.23)
CIE-LCH	lch(41.88, 72.36, 295.65°)
OKLab	oklab(51.11% -0.0003 -0.188)
OKLCH	oklch(51.11% 0.188 269.9)
XYZ	xyz(16.8394, 12.4255, 61.1732)
Luminance	0.1243 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57D0 #D0B83F

analogous

#3F9FD0 #3F57D0 #6F3FD0

triadic

#3F57D0 #D03F57 #57D03F

tetradic

#3F57D0 #D03F9F #D0B83F #3FD06F

square

#3F57D0 #D03F9F #D0B83F #3FD06F

split-complementary

#3F57D0 #D06F3F #9FD03F

monochromatic

#1D2C77 #293EA9 #3F57D0 #7082DC #A1ADE8

Accessibility & contrast

On white

6.03

#3F57D0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.49

#3F57D0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57D0

6.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57D0	#FFFFFF	#000000	##FFFFFF
##3F57D0	1.00	6.03	3.49	6.03
#FFFFFF	6.03	1.00	21.00	1.00
#000000	3.49	21.00	1.00	21.00
##FFFFFF	6.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006AD4

Deuteranopia (green-blind)

#005CCE

Tritanopia (blue-blind)

#00758B

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #3f57d0;
/* rgb */ color: rgb(63, 87, 208);
/* oklch */ color: oklch(51.1% 0.188 269.9);

Tailwind

colors: {
  custom: {
    50: '#8686df',
    500: '#3f57d0',
    950: '#000000',
  },
}

SCSS

$custom: #3f57d0;
$custom-light: #8686df;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57d0",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 208
  },
  "hsl": {
    "h": 230.069,
    "s": 60.669,
    "l": 53.137
  },
  "oklch": {
    "l": 0.51107,
    "c": 0.18805,
    "h": 269.9
  },
  "luminance": 0.12427
}

Semantic roles & 50–950 ramp

primary

#3F57D0

secondary

#D5CA96

accent

#C944E4

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0D0B15

muted

#7D7C83

Preview Lab

Preview with #3F57D0

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

Preview Lab → · Contrast checker → · Palette generator →