#313F9B#313F9B

#313F9B is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.4% C 0.150 H 271.6°. Best body text is #FFFFFF at 9.07:1 contrast (WCAG AA passes).

Color values

HEX	#313F9B
RGB	rgb(49, 63, 155)
HSL	hsl(232, 52%, 40%)
HSV	hsv(232, 68%, 61%)
CMYK	cmyk(68.4%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(30.82, 25.75, -51.98)
CIE-LCH	lch(30.82, 58.01, 296.36°)
OKLab	oklab(41.36% 0.0043 -0.1497)
OKLCH	oklch(41.36% 0.15 271.6)
XYZ	xyz(8.9585, 6.5737, 31.8007)
Luminance	0.0658 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313F9B #9B8D31

analogous

#31749B #313F9B #58319B

triadic

#313F9B #9B313F #3F9B31

tetradic

#313F9B #9B3174 #9B8D31 #319B58

square

#313F9B #9B3174 #9B8D31 #319B58

split-complementary

#313F9B #9B5831 #749B31

monochromatic

#14193E #222C6D #313F9B #4556C4 #7380D3

Accessibility & contrast

On white

9.07

#313F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#313F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313F9B

9.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313F9B	#FFFFFF	#000000	##FFFFFF
##313F9B	1.00	9.07	2.32	9.07
#FFFFFF	9.07	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9E

Deuteranopia (green-blind)

#004499

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #313f9b;
/* rgb */ color: rgb(49, 63, 155);
/* oklch */ color: oklch(41.4% 0.150 271.6);

Tailwind

colors: {
  custom: {
    50: '#7673b9',
    500: '#313f9b',
    950: '#000000',
  },
}

SCSS

$custom: #313f9b;
$custom-light: #7673b9;
$custom-dark: #000000;

JSON

{
  "hex": "#313f9b",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 232.075,
    "s": 51.961,
    "l": 40
  },
  "oklch": {
    "l": 0.41363,
    "c": 0.14978,
    "h": 271.6
  },
  "luminance": 0.06575
}

Semantic roles & 50–950 ramp

primary

#313F9B

secondary

#BBB16D

accent

#C94CDB

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #313F9B

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

Preview Lab → · Contrast checker → · Palette generator →