#3F57B2#3F57B2

#3F57B2 is a mid, vivid blue. Relative luminance 0.111; OKLCH L 48.8% C 0.147 H 269.2°. Best body text is #FFFFFF at 6.53:1 contrast (WCAG AA passes).

Color values

HEX	#3F57B2
RGB	rgb(63, 87, 178)
HSL	hsl(227, 48%, 47%)
HSV	hsv(227, 65%, 70%)
CMYK	cmyk(64.6%, 51.1%, 0%, 30.2%)
CIE-LAB	lab(39.73, 20.62, -51.27)
CIE-LCH	lch(39.73, 55.26, 291.91°)
OKLab	oklab(48.8% -0.002 -0.147)
OKLCH	oklch(48.8% 0.147 269.2)
XYZ	xyz(13.4912, 11.0863, 43.5397)
Luminance	0.1109 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57B2 #B29A3F

analogous

#3F91B2 #3F57B2 #603FB2

triadic

#3F57B2 #B23F57 #57B23F

tetradic

#3F57B2 #B23F91 #B29A3F #3FB260

square

#3F57B2 #B23F91 #B29A3F #3FB260

split-complementary

#3F57B2 #B2603F #91B23F

monochromatic

#1F2B58 #2F4185 #3F57B2 #667AC9 #93A1D9

Accessibility & contrast

On white

6.53

#3F57B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.22

#3F57B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57B2

6.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57B2	#FFFFFF	#000000	##FFFFFF
##3F57B2	1.00	6.53	3.22	6.53
#FFFFFF	6.53	1.00	21.00	1.00
#000000	3.22	21.00	1.00	21.00
##FFFFFF	6.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2363B5

Deuteranopia (green-blind)

#0059B0

Tritanopia (blue-blind)

#006C7C

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f57b2;
/* rgb */ color: rgb(63, 87, 178);
/* oklch */ color: oklch(48.8% 0.147 269.2);

Tailwind

colors: {
  custom: {
    50: '#8086ca',
    500: '#3f57b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f57b2;
$custom-light: #8086ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57b2",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 178
  },
  "hsl": {
    "h": 227.478,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.48802,
    "c": 0.147,
    "h": 269.2
  },
  "luminance": 0.11088
}

Semantic roles & 50–950 ramp

primary

#3F57B2

secondary

#C4B889

accent

#BB50D7

background

#F8F8FC

surface

#EFEFF8

border

#CACAD1

text

#0B0B13

muted

#7C7C82

Preview Lab

Preview with #3F57B2

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

Preview Lab → · Contrast checker → · Palette generator →