#3F57BA#3F57BA

#3F57BA is a mid, vivid blue. Relative luminance 0.114; OKLCH L 49.4% C 0.158 H 269.5°. Best body text is #FFFFFF at 6.40:1 contrast (WCAG AA passes).

Color values

HEX	#3F57BA
RGB	rgb(63, 87, 186)
HSL	hsl(228, 49%, 49%)
HSV	hsv(228, 66%, 73%)
CMYK	cmyk(66.1%, 53.2%, 0%, 27.1%)
CIE-LAB	lab(40.27, 23.48, -55.08)
CIE-LCH	lch(40.27, 59.88, 293.09°)
OKLab	oklab(49.39% -0.0013 -0.1582)
OKLCH	oklch(49.39% 0.158 269.5)
XYZ	xyz(14.3180, 11.4170, 47.8940)
Luminance	0.1142 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57BA #BAA23F

analogous

#3F95BA #3F57BA #653FBA

triadic

#3F57BA #BA3F57 #57BA3F

tetradic

#3F57BA #BA3F95 #BAA23F #3FBA65

square

#3F57BA #BA3F95 #BAA23F #3FBA65

split-complementary

#3F57BA #BA653F #95BA3F

monochromatic

#202C5F #30428C #3F57BA #6A7DCC #97A5DC

Accessibility & contrast

On white

6.40

#3F57BA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.28

#3F57BA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57BA

6.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57BA	#FFFFFF	#000000	##FFFFFF
##3F57BA	1.00	6.40	3.28	6.40
#FFFFFF	6.40	1.00	21.00	1.00
#000000	3.28	21.00	1.00	21.00
##FFFFFF	6.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1565BD

Deuteranopia (green-blind)

#005AB8

Tritanopia (blue-blind)

#006E80

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #3f57ba;
/* rgb */ color: rgb(63, 87, 186);
/* oklch */ color: oklch(49.4% 0.158 269.5);

Tailwind

colors: {
  custom: {
    50: '#8286cf',
    500: '#3f57ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f57ba;
$custom-light: #8286cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57ba",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 186
  },
  "hsl": {
    "h": 228.293,
    "s": 49.398,
    "l": 48.824
  },
  "oklch": {
    "l": 0.49392,
    "c": 0.15821,
    "h": 269.5
  },
  "luminance": 0.11418
}

Semantic roles & 50–950 ramp

primary

#3F57BA

secondary

#C8BC8D

accent

#BE4FD9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0B14

muted

#7D7C82

Preview Lab

Preview with #3F57BA

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

Preview Lab → · Contrast checker → · Palette generator →