#313FB5#313FB5

#313FB5 is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.7% C 0.185 H 271.1°. Best body text is #FFFFFF at 8.37:1 contrast (WCAG AA passes).

Color values

HEX	#313FB5
RGB	rgb(49, 63, 181)
HSL	hsl(234, 57%, 45%)
HSV	hsv(234, 73%, 71%)
CMYK	cmyk(72.9%, 65.2%, 0%, 29%)
CIE-LAB	lab(33.01, 35.19, -63.99)
CIE-LCH	lch(33.01, 73.03, 298.81°)
OKLab	oklab(43.66% 0.0035 -0.1849)
OKLCH	oklch(43.66% 0.185 271.1)
XYZ	xyz(11.3818, 7.5430, 44.5632)
Luminance	0.0754 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313FB5 #B5A731

analogous

#3181B5 #313FB5 #6531B5

triadic

#313FB5 #B5313F #3FB531

tetradic

#313FB5 #B53181 #B5A731 #31B565

square

#313FB5 #B53181 #B5A731 #31B565

split-complementary

#313FB5 #B56531 #81B531

monochromatic

#171D55 #242E85 #313FB5 #5360D0 #838DDD

Accessibility & contrast

On white

8.37

#313FB5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#313FB5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313FB5

8.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313FB5	#FFFFFF	#000000	##FFFFFF
##313FB5	1.00	8.37	2.51	8.37
#FFFFFF	8.37	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B9

Deuteranopia (green-blind)

#0048B3

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #313fb5;
/* rgb */ color: rgb(49, 63, 181);
/* oklch */ color: oklch(43.7% 0.185 271.1);

Tailwind

colors: {
  custom: {
    50: '#7c74cc',
    500: '#313fb5',
    950: '#000000',
  },
}

SCSS

$custom: #313fb5;
$custom-light: #7c74cc;
$custom-dark: #000000;

JSON

{
  "hex": "#313fb5",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 181
  },
  "hsl": {
    "h": 233.636,
    "s": 57.391,
    "l": 45.098
  },
  "oklch": {
    "l": 0.43664,
    "c": 0.18498,
    "h": 271.1
  },
  "luminance": 0.07544
}

Semantic roles & 50–950 ramp

primary

#313FB5

secondary

#C7BF7B

accent

#D047E1

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #313FB5

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

Preview Lab → · Contrast checker → · Palette generator →