#313F99#313F99

#313F99 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.2% C 0.147 H 271.6°. Best body text is #FFFFFF at 9.12:1 contrast (WCAG AA passes).

Color values

HEX	#313F99
RGB	rgb(49, 63, 153)
HSL	hsl(232, 51%, 40%)
HSV	hsv(232, 68%, 60%)
CMYK	cmyk(68%, 58.8%, 0%, 40%)
CIE-LAB	lab(30.66, 25.02, -51.02)
CIE-LCH	lch(30.66, 56.82, 296.12°)
OKLab	oklab(41.2% 0.0042 -0.1469)
OKLCH	oklch(41.2% 0.147 271.6)
XYZ	xyz(8.7920, 6.5071, 30.9235)
Luminance	0.0651 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313F99 #998B31

analogous

#317399 #313F99 #573199

triadic

#313F99 #99313F #3F9931

tetradic

#313F99 #993173 #998B31 #319957

square

#313F99 #993173 #998B31 #319957

split-complementary

#313F99 #995731 #739931

monochromatic

#13193C #222C6B #313F99 #4455C3 #727FD2

Accessibility & contrast

On white

9.12

#313F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#313F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313F99

9.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313F99	#FFFFFF	#000000	##FFFFFF
##313F99	1.00	9.12	2.30	9.12
#FFFFFF	9.12	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9C

Deuteranopia (green-blind)

#004497

Tritanopia (blue-blind)

#005565

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #313f99;
/* rgb */ color: rgb(49, 63, 153);
/* oklch */ color: oklch(41.2% 0.147 271.6);

Tailwind

colors: {
  custom: {
    50: '#7673b8',
    500: '#313f99',
    950: '#000000',
  },
}

SCSS

$custom: #313f99;
$custom-light: #7673b8;
$custom-dark: #000000;

JSON

{
  "hex": "#313f99",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 231.923,
    "s": 51.485,
    "l": 39.608
  },
  "oklch": {
    "l": 0.41195,
    "c": 0.14696,
    "h": 271.6
  },
  "luminance": 0.06508
}

Semantic roles & 50–950 ramp

primary

#313F99

secondary

#BAAF6C

accent

#C84DDB

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#090811

muted

#7B7B80

Preview Lab

Preview with #313F99

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

Preview Lab → · Contrast checker → · Palette generator →