#313F8B#313F8B

#313F8B is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.1% C 0.127 H 271.6°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#313F8B
RGB	rgb(49, 63, 139)
HSL	hsl(231, 48%, 37%)
HSV	hsv(231, 65%, 55%)
CMYK	cmyk(64.7%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(29.59, 19.86, -44.17)
CIE-LCH	lch(29.59, 48.43, 294.21°)
OKLab	oklab(40.06% 0.0036 -0.1267)
OKLCH	oklch(40.06% 0.127 271.6)
XYZ	xyz(7.7028, 6.0714, 25.1871)
Luminance	0.0607 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313F8B #8B7D31

analogous

#316C8B #313F8B #50318B

triadic

#313F8B #8B313F #3F8B31

tetradic

#313F8B #8B316C #8B7D31 #318B50

square

#313F8B #8B316C #8B7D31 #318B50

split-complementary

#313F8B #8B5031 #6C8B31

monochromatic

#111631 #212A5E #313F8B #4154B8 #6B7ACB

Accessibility & contrast

On white

9.48

#313F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#313F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313F8B

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313F8B	#FFFFFF	#000000	##FFFFFF
##313F8B	1.00	9.48	2.21	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D4A8E

Deuteranopia (green-blind)

#004289

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #313f8b;
/* rgb */ color: rgb(49, 63, 139);
/* oklch */ color: oklch(40.1% 0.127 271.6);

Tailwind

colors: {
  custom: {
    50: '#7373ad',
    500: '#313f8b',
    950: '#000000',
  },
}

SCSS

$custom: #313f8b;
$custom-light: #7373ad;
$custom-dark: #000000;

JSON

{
  "hex": "#313f8b",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 230.667,
    "s": 47.872,
    "l": 36.863
  },
  "oklch": {
    "l": 0.4006,
    "c": 0.12679,
    "h": 271.6
  },
  "luminance": 0.06072
}

Semantic roles & 50–950 ramp

primary

#313F8B

secondary

#B2A665

accent

#C250D7

background

#F7F7FA

surface

#EDEDF4

border

#C8C8CE

text

#090810

muted

#7B7B7F

Preview Lab

Preview with #313F8B

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

Preview Lab → · Contrast checker → · Palette generator →