#313B9E#313B9E

#313B9E is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.9% C 0.159 H 272.7°. Best body text is #FFFFFF at 9.33:1 contrast (WCAG AA passes).

Color values

HEX	#313B9E
RGB	rgb(49, 59, 158)
HSL	hsl(234, 53%, 41%)
HSV	hsv(234, 69%, 62%)
CMYK	cmyk(69%, 62.7%, 0%, 38%)
CIE-LAB	lab(30.03, 29.49, -55.08)
CIE-LCH	lch(30.03, 62.47, 298.16°)
OKLab	oklab(40.86% 0.0075 -0.1589)
OKLCH	oklch(40.86% 0.159 272.7)
XYZ	xyz(9.0001, 6.2487, 33.0729)
Luminance	0.0625 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313B9E #9E9431

analogous

#31729E #313B9E #5D319E

triadic

#313B9E #9E313B #3B9E31

tetradic

#313B9E #9E3172 #9E9431 #319E5D

square

#313B9E #9E3172 #9E9431 #319E5D

split-complementary

#313B9E #9E5D31 #729E31

monochromatic

#141841 #232A6F #313B9E #4652C6 #757ED4

Accessibility & contrast

On white

9.33

#313B9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#313B9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313B9E

9.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313B9E	#FFFFFF	#000000	##FFFFFF
##313B9E	1.00	9.33	2.25	9.33
#FFFFFF	9.33	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA1

Deuteranopia (green-blind)

#00429C

Tritanopia (blue-blind)

#005467

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #313b9e;
/* rgb */ color: rgb(49, 59, 158);
/* oklch */ color: oklch(40.9% 0.159 272.7);

Tailwind

colors: {
  custom: {
    50: '#7771bb',
    500: '#313b9e',
    950: '#000000',
  },
}

SCSS

$custom: #313b9e;
$custom-light: #7771bb;
$custom-dark: #000000;

JSON

{
  "hex": "#313b9e",
  "rgb": {
    "r": 49,
    "g": 59,
    "b": 158
  },
  "hsl": {
    "h": 234.495,
    "s": 52.657,
    "l": 40.588
  },
  "oklch": {
    "l": 0.40858,
    "c": 0.15904,
    "h": 272.7
  },
  "luminance": 0.0625
}

Semantic roles & 50–950 ramp

primary

#313B9E

secondary

#BCB56E

accent

#CF4CDC

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0712

muted

#7C7A81

Preview Lab

Preview with #313B9E

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

Preview Lab → · Contrast checker → · Palette generator →