#313F8A#313F8A

#313F8A is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.0% C 0.125 H 271.6°. Best body text is #FFFFFF at 9.51:1 contrast (WCAG AA passes).

Color values

HEX	#313F8A
RGB	rgb(49, 63, 138)
HSL	hsl(231, 48%, 37%)
HSV	hsv(231, 64%, 54%)
CMYK	cmyk(64.5%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(29.52, 19.49, -43.67)
CIE-LCH	lch(29.52, 47.82, 294.05°)
OKLab	oklab(39.98% 0.0036 -0.1253)
OKLCH	oklch(39.98% 0.125 271.6)
XYZ	xyz(7.6300, 6.0423, 24.8040)
Luminance	0.0604 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313F8A #8A7C31

analogous

#316C8A #313F8A #50318A

triadic

#313F8A #8A313F #3F8A31

tetradic

#313F8A #8A316C #8A7C31 #318A50

square

#313F8A #8A316C #8A7C31 #318A50

split-complementary

#313F8A #8A5031 #6C8A31

monochromatic

#111630 #212A5D #313F8A #4154B7 #6B7ACA

Accessibility & contrast

On white

9.51

#313F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#313F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313F8A

9.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313F8A	#FFFFFF	#000000	##FFFFFF
##313F8A	1.00	9.51	2.21	9.51
#FFFFFF	9.51	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F4A8D

Deuteranopia (green-blind)

#004288

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #313f8a;
/* rgb */ color: rgb(49, 63, 138);
/* oklch */ color: oklch(40.0% 0.125 271.6);

Tailwind

colors: {
  custom: {
    50: '#7373ad',
    500: '#313f8a',
    950: '#000000',
  },
}

SCSS

$custom: #313f8a;
$custom-light: #7373ad;
$custom-dark: #000000;

JSON

{
  "hex": "#313f8a",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 230.562,
    "s": 47.594,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39982,
    "c": 0.12532,
    "h": 271.6
  },
  "luminance": 0.06043
}

Semantic roles & 50–950 ramp

primary

#313F8A

secondary

#B2A665

accent

#C251D7

background

#F7F7FA

surface

#EDEDF4

border

#C8C8CE

text

#090810

muted

#7B7B7F

Preview Lab

Preview with #313F8A

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

Preview Lab → · Contrast checker → · Palette generator →