#3F57BF#3F57BF

#3F57BF is a mid, vivid blue. Relative luminance 0.116; OKLCH L 49.8% C 0.165 H 269.7°. Best body text is #FFFFFF at 6.31:1 contrast (WCAG AA passes).

Color values

HEX	#3F57BF
RGB	rgb(63, 87, 191)
HSL	hsl(229, 50%, 50%)
HSV	hsv(229, 67%, 75%)
CMYK	cmyk(67%, 54.5%, 0%, 25.1%)
CIE-LAB	lab(40.63, 25.27, -57.43)
CIE-LCH	lch(40.63, 62.74, 293.75°)
OKLab	oklab(49.77% -0.001 -0.1651)
OKLCH	oklch(49.77% 0.165 269.7)
XYZ	xyz(14.8589, 11.6333, 50.7425)
Luminance	0.1163 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57BF #BFA73F

analogous

#3F97BF #3F57BF #673FBF

triadic

#3F57BF #BF3F57 #57BF3F

tetradic

#3F57BF #BF3F97 #BFA73F #3FBF67

square

#3F57BF #BF3F97 #BFA73F #3FBF67

split-complementary

#3F57BF #BF673F #97BF3F

monochromatic

#212D63 #304291 #3F57BF #6D7FCF #9BA7DE

Accessibility & contrast

On white

6.31

#3F57BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.33

#3F57BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57BF

6.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57BF	#FFFFFF	#000000	##FFFFFF
##3F57BF	1.00	6.31	3.33	6.31
#FFFFFF	6.31	1.00	21.00	1.00
#000000	3.33	21.00	1.00	21.00
##FFFFFF	6.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0466C3

Deuteranopia (green-blind)

#005ABD

Tritanopia (blue-blind)

#007082

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #3f57bf;
/* rgb */ color: rgb(63, 87, 191);
/* oklch */ color: oklch(49.8% 0.165 269.7);

Tailwind

colors: {
  custom: {
    50: '#8286d3',
    500: '#3f57bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f57bf;
$custom-light: #8286d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57bf",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 191
  },
  "hsl": {
    "h": 228.75,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.4977,
    "c": 0.16511,
    "h": 269.7
  },
  "luminance": 0.11635
}

Semantic roles & 50–950 ramp

primary

#3F57BF

secondary

#CABF90

accent

#C04EDA

background

#F8F8FD

surface

#F0EFFA

border

#CBCAD3

text

#0C0B14

muted

#7D7C83

Preview Lab

Preview with #3F57BF

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

Preview Lab → · Contrast checker → · Palette generator →