#3F57BE#3F57BE

#3F57BE is a mid, vivid blue. Relative luminance 0.116; OKLCH L 49.7% C 0.164 H 269.6°. Best body text is #FFFFFF at 6.33:1 contrast (WCAG AA passes).

Color values

HEX	#3F57BE
RGB	rgb(63, 87, 190)
HSL	hsl(229, 50%, 50%)
HSV	hsv(229, 67%, 75%)
CMYK	cmyk(66.8%, 54.2%, 0%, 25.5%)
CIE-LAB	lab(40.56, 24.91, -56.96)
CIE-LCH	lch(40.56, 62.17, 293.62°)
OKLab	oklab(49.69% -0.001 -0.1637)
OKLCH	oklch(49.69% 0.164 269.6)
XYZ	xyz(14.7492, 11.5895, 50.1649)
Luminance	0.1159 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57BE #BEA63F

analogous

#3F97BE #3F57BE #663FBE

triadic

#3F57BE #BE3F57 #57BE3F

tetradic

#3F57BE #BE3F97 #BEA63F #3FBE66

square

#3F57BE #BE3F97 #BEA63F #3FBE66

split-complementary

#3F57BE #BE663F #97BE3F

monochromatic

#212D62 #304290 #3F57BE #6C7FCE #9AA7DD

Accessibility & contrast

On white

6.33

#3F57BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.32

#3F57BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57BE

6.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57BE	#FFFFFF	#000000	##FFFFFF
##3F57BE	1.00	6.33	3.32	6.33
#FFFFFF	6.33	1.00	21.00	1.00
#000000	3.32	21.00	1.00	21.00
##FFFFFF	6.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0866C2

Deuteranopia (green-blind)

#005ABC

Tritanopia (blue-blind)

#007082

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #3f57be;
/* rgb */ color: rgb(63, 87, 190);
/* oklch */ color: oklch(49.7% 0.164 269.6);

Tailwind

colors: {
  custom: {
    50: '#8286d2',
    500: '#3f57be',
    950: '#000000',
  },
}

SCSS

$custom: #3f57be;
$custom-light: #8286d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57be",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 190
  },
  "hsl": {
    "h": 228.661,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.49694,
    "c": 0.16373,
    "h": 269.6
  },
  "luminance": 0.11591
}

Semantic roles & 50–950 ramp

primary

#3F57BE

secondary

#C9BE8F

accent

#BF4EDA

background

#F8F8FD

surface

#F0EFFA

border

#CBCAD3

text

#0C0B14

muted

#7D7C83

Preview Lab

Preview with #3F57BE

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

Preview Lab → · Contrast checker → · Palette generator →