#311F8E#311F8E

#311F8E is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.8% C 0.170 H 280.2°. Best body text is #FFFFFF at 12.23:1 contrast (WCAG AA passes).

Color values

HEX	#311F8E
RGB	rgb(49, 31, 142)
HSL	hsl(250, 64%, 34%)
HSV	hsv(250, 78%, 56%)
CMYK	cmyk(65.5%, 78.2%, 0%, 44.3%)
CIE-LAB	lab(22.25, 41.03, -58.02)
CIE-LCH	lch(22.25, 71.06, 305.27°)
OKLab	oklab(34.79% 0.0302 -0.1674)
OKLCH	oklch(34.79% 0.17 280.2)
XYZ	xyz(6.6375, 3.5854, 25.9282)
Luminance	0.0359 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#311F8E #7C8E1F

analogous

#1F458E #311F8E #691F8E

triadic

#311F8E #8E311F #1F8E31

tetradic

#311F8E #8E1F45 #7C8E1F #1F8E69

square

#311F8E #8E1F45 #7C8E1F #1F8E69

split-complementary

#311F8E #8E691F #458E1F

monochromatic

#0E092A #20145C #311F8E #422AC0 #654FD9

Accessibility & contrast

On white

12.23

#311F8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#311F8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #311F8E

12.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##311F8E	#FFFFFF	#000000	##FFFFFF
##311F8E	1.00	12.23	1.72	12.23
#FFFFFF	12.23	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003991

Deuteranopia (green-blind)

#00318C

Tritanopia (blue-blind)

#003F55

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #311f8e;
/* rgb */ color: rgb(49, 31, 142);
/* oklch */ color: oklch(34.8% 0.170 280.2);

Tailwind

colors: {
  custom: {
    50: '#765eb0',
    500: '#311f8e',
    950: '#000000',
  },
}

SCSS

$custom: #311f8e;
$custom-light: #765eb0;
$custom-dark: #000000;

JSON

{
  "hex": "#311f8e",
  "rgb": {
    "r": 49,
    "g": 31,
    "b": 142
  },
  "hsl": {
    "h": 249.73,
    "s": 64.162,
    "l": 33.922
  },
  "oklch": {
    "l": 0.34789,
    "c": 0.17016,
    "h": 280.2
  },
  "luminance": 0.03586
}

Semantic roles & 50–950 ramp

primary

#311F8E

secondary

#AABB4D

accent

#E741CC

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0411

muted

#7C7980

Preview Lab

Preview with #311F8E

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

Preview Lab → · Contrast checker → · Palette generator →