#3F57BD#3F57BD

#3F57BD is a mid, vivid blue. Relative luminance 0.115; OKLCH L 49.6% C 0.162 H 269.6°. Best body text is #FFFFFF at 6.35:1 contrast (WCAG AA passes).

Color values

HEX	#3F57BD
RGB	rgb(63, 87, 189)
HSL	hsl(229, 50%, 49%)
HSV	hsv(229, 67%, 74%)
CMYK	cmyk(66.7%, 54%, 0%, 25.9%)
CIE-LAB	lab(40.49, 24.55, -56.49)
CIE-LCH	lch(40.49, 61.60, 293.49°)
OKLab	oklab(49.62% -0.0011 -0.1623)
OKLCH	oklch(49.62% 0.162 269.6)
XYZ	xyz(14.6403, 11.5459, 49.5913)
Luminance	0.1155 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57BD #BDA53F

analogous

#3F96BD #3F57BD #663FBD

triadic

#3F57BD #BD3F57 #57BD3F

tetradic

#3F57BD #BD3F96 #BDA53F #3FBD66

square

#3F57BD #BD3F96 #BDA53F #3FBD66

split-complementary

#3F57BD #BD663F #96BD3F

monochromatic

#202D61 #30428F #3F57BD #6B7ECE #99A6DD

Accessibility & contrast

On white

6.35

#3F57BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.31

#3F57BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57BD

6.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57BD	#FFFFFF	#000000	##FFFFFF
##3F57BD	1.00	6.35	3.31	6.35
#FFFFFF	6.35	1.00	21.00	1.00
#000000	3.31	21.00	1.00	21.00
##FFFFFF	6.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C65C1

Deuteranopia (green-blind)

#005ABB

Tritanopia (blue-blind)

#006F81

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #3f57bd;
/* rgb */ color: rgb(63, 87, 189);
/* oklch */ color: oklch(49.6% 0.162 269.6);

Tailwind

colors: {
  custom: {
    50: '#8286d2',
    500: '#3f57bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f57bd;
$custom-light: #8286d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57bd",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 189
  },
  "hsl": {
    "h": 228.571,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.49618,
    "c": 0.16235,
    "h": 269.6
  },
  "luminance": 0.11547
}

Semantic roles & 50–950 ramp

primary

#3F57BD

secondary

#C9BE8F

accent

#BF4EDA

background

#F8F8FD

surface

#F0EFFA

border

#CBCAD3

text

#0C0B14

muted

#7D7C83

Preview Lab

Preview with #3F57BD

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

Preview Lab → · Contrast checker → · Palette generator →