#3F57D7#3F57D7

#3F57D7 is a mid, vivid blue. Relative luminance 0.128; OKLCH L 51.7% C 0.197 H 269.9°. Best body text is #FFFFFF at 5.91:1 contrast (WCAG AA passes).

Color values

HEX	#3F57D7
RGB	rgb(63, 87, 215)
HSL	hsl(231, 66%, 55%)
HSV	hsv(231, 71%, 84%)
CMYK	cmyk(70.7%, 59.5%, 0%, 15.7%)
CIE-LAB	lab(42.43, 33.80, -68.36)
CIE-LCH	lch(42.43, 76.26, 296.31°)
OKLab	oklab(51.68% -0.0003 -0.1973)
OKLCH	oklch(51.68% 0.197 269.9)
XYZ	xyz(17.7196, 12.7777, 65.8093)
Luminance	0.1278 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57D7 #D7BF3F

analogous

#3FA3D7 #3F57D7 #733FD7

triadic

#3F57D7 #D73F57 #57D73F

tetradic

#3F57D7 #D73FA3 #D7BF3F #3FD773

square

#3F57D7 #D73FA3 #D7BF3F #3FD773

split-complementary

#3F57D7 #D7733F #A3D73F

monochromatic

#1B2B81 #253CB3 #3F57D7 #7283E2 #A4B0EC

Accessibility & contrast

On white

5.91

#3F57D7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.56

#3F57D7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57D7

5.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57D7	#FFFFFF	#000000	##FFFFFF
##3F57D7	1.00	5.91	3.56	5.91
#FFFFFF	5.91	1.00	21.00	1.00
#000000	3.56	21.00	1.00	21.00
##FFFFFF	5.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006BDB

Deuteranopia (green-blind)

#005DD5

Tritanopia (blue-blind)

#00778F

Achromatopsia (no color)

#646464

Design tokens & code

CSS

--color: #3f57d7;
/* rgb */ color: rgb(63, 87, 215);
/* oklch */ color: oklch(51.7% 0.197 269.9);

Tailwind

colors: {
  custom: {
    50: '#8786e4',
    500: '#3f57d7',
    950: '#000000',
  },
}

SCSS

$custom: #3f57d7;
$custom-light: #8786e4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57d7",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 215
  },
  "hsl": {
    "h": 230.526,
    "s": 65.517,
    "l": 54.51
  },
  "oklch": {
    "l": 0.51679,
    "c": 0.19726,
    "h": 269.9
  },
  "luminance": 0.12779
}

Semantic roles & 50–950 ramp

primary

#3F57D7

secondary

#D9CF99

accent

#CE3FE8

background

#F9F8FE

surface

#F1EFFC

border

#CBCAD5

text

#0D0B16

muted

#7E7C84

Preview Lab

Preview with #3F57D7

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

Preview Lab → · Contrast checker → · Palette generator →