#313B99#313B99

#313B99 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.4% C 0.152 H 272.9°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#313B99
RGB	rgb(49, 59, 153)
HSL	hsl(234, 51%, 40%)
HSV	hsv(234, 68%, 60%)
CMYK	cmyk(68%, 61.4%, 0%, 40%)
CIE-LAB	lab(29.61, 27.67, -52.72)
CIE-LCH	lch(29.61, 59.54, 297.69°)
OKLab	oklab(40.42% 0.0077 -0.1519)
OKLCH	oklch(40.42% 0.152 272.9)
XYZ	xyz(8.5784, 6.0800, 30.8523)
Luminance	0.0608 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313B99 #998F31

analogous

#316F99 #313B99 #5B3199

triadic

#313B99 #99313B #3B9931

tetradic

#313B99 #99316F #998F31 #31995B

square

#313B99 #99316F #998F31 #31995B

split-complementary

#313B99 #995B31 #6F9931

monochromatic

#13173C #22296B #313B99 #4450C3 #727CD2

Accessibility & contrast

On white

9.48

#313B99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#313B99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313B99

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313B99	#FFFFFF	#000000	##FFFFFF
##313B99	1.00	9.48	2.22	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9C

Deuteranopia (green-blind)

#004197

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #313b99;
/* rgb */ color: rgb(49, 59, 153);
/* oklch */ color: oklch(40.4% 0.152 272.9);

Tailwind

colors: {
  custom: {
    50: '#7671b8',
    500: '#313b99',
    950: '#000000',
  },
}

SCSS

$custom: #313b99;
$custom-light: #7671b8;
$custom-dark: #000000;

JSON

{
  "hex": "#313b99",
  "rgb": {
    "r": 49,
    "g": 59,
    "b": 153
  },
  "hsl": {
    "h": 234.231,
    "s": 51.485,
    "l": 39.608
  },
  "oklch": {
    "l": 0.4042,
    "c": 0.15213,
    "h": 272.9
  },
  "luminance": 0.06081
}

Semantic roles & 50–950 ramp

primary

#313B99

secondary

#BAB26C

accent

#CD4DDB

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0711

muted

#7C7A80

Preview Lab

Preview with #313B99

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

Preview Lab → · Contrast checker → · Palette generator →