#3F57D9#3F57D9

#3F57D9 is a mid, vivid blue. Relative luminance 0.129; OKLCH L 51.8% C 0.200 H 269.9°. Best body text is #FFFFFF at 5.87:1 contrast (WCAG AA passes).

Color values

HEX	#3F57D9
RGB	rgb(63, 87, 217)
HSL	hsl(231, 67%, 55%)
HSV	hsv(231, 71%, 85%)
CMYK	cmyk(71%, 59.9%, 0%, 14.9%)
CIE-LAB	lab(42.58, 34.50, -69.25)
CIE-LCH	lch(42.58, 77.37, 296.48°)
OKLab	oklab(51.85% -0.0003 -0.1999)
OKLCH	oklch(51.85% 0.2 269.9)
XYZ	xyz(17.9782, 12.8811, 67.1710)
Luminance	0.1288 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57D9 #D9C13F

analogous

#3FA4D9 #3F57D9 #743FD9

triadic

#3F57D9 #D93F57 #57D93F

tetradic

#3F57D9 #D93FA4 #D9C13F #3FD974

square

#3F57D9 #D93FA4 #D9C13F #3FD974

split-complementary

#3F57D9 #D9743F #A4D93F

monochromatic

#1A2A84 #243BB7 #3F57D9 #7284E3 #A5B0ED

Accessibility & contrast

On white

5.87

#3F57D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.58

#3F57D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57D9

5.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57D9	#FFFFFF	#000000	##FFFFFF
##3F57D9	1.00	5.87	3.58	5.87
#FFFFFF	5.87	1.00	21.00	1.00
#000000	3.58	21.00	1.00	21.00
##FFFFFF	5.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006CDD

Deuteranopia (green-blind)

#005ED6

Tritanopia (blue-blind)

#007890

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #3f57d9;
/* rgb */ color: rgb(63, 87, 217);
/* oklch */ color: oklch(51.8% 0.200 269.9);

Tailwind

colors: {
  custom: {
    50: '#8886e6',
    500: '#3f57d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f57d9;
$custom-light: #8886e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57d9",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 217
  },
  "hsl": {
    "h": 230.649,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.51845,
    "c": 0.19986,
    "h": 269.9
  },
  "luminance": 0.12883
}

Semantic roles & 50–950 ramp

primary

#3F57D9

secondary

#DAD09A

accent

#CF3EEA

background

#F9F8FE

surface

#F1EFFC

border

#CBCAD5

text

#0D0B16

muted

#7E7C84

Preview Lab

Preview with #3F57D9

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

Preview Lab → · Contrast checker → · Palette generator →