#313FAB#313FAB

#313FAB is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.8% C 0.172 H 271.3°. Best body text is #FFFFFF at 8.64:1 contrast (WCAG AA passes).

Color values

HEX	#313FAB
RGB	rgb(49, 63, 171)
HSL	hsl(233, 55%, 43%)
HSV	hsv(233, 71%, 67%)
CMYK	cmyk(71.3%, 63.2%, 0%, 32.9%)
CIE-LAB	lab(32.14, 31.59, -59.46)
CIE-LCH	lch(32.14, 67.33, 297.98°)
OKLab	oklab(42.76% 0.004 -0.1717)
OKLCH	oklch(42.76% 0.172 271.3)
XYZ	xyz(10.3923, 7.1472, 39.3520)
Luminance	0.0715 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.44

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313FAB #AB9D31

analogous

#317CAB #313FAB #6031AB

triadic

#313FAB #AB313F #3FAB31

tetradic

#313FAB #AB317C #AB9D31 #31AB60

square

#313FAB #AB317C #AB9D31 #31AB60

split-complementary

#313FAB #AB6031 #7CAB31

monochromatic

#161C4C #232D7B #313FAB #4D5CCC #7D87DA

Accessibility & contrast

On white

8.64

#313FAB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#313FAB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313FAB

8.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313FAB	#FFFFFF	#000000	##FFFFFF
##313FAB	1.00	8.64	2.43	8.64
#FFFFFF	8.64	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AE

Deuteranopia (green-blind)

#0046A9

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #313fab;
/* rgb */ color: rgb(49, 63, 171);
/* oklch */ color: oklch(42.8% 0.172 271.3);

Tailwind

colors: {
  custom: {
    50: '#7a74c5',
    500: '#313fab',
    950: '#000000',
  },
}

SCSS

$custom: #313fab;
$custom-light: #7a74c5;
$custom-dark: #000000;

JSON

{
  "hex": "#313fab",
  "rgb": {
    "r": 49,
    "g": 63,
    "b": 171
  },
  "hsl": {
    "h": 233.115,
    "s": 55.455,
    "l": 43.137
  },
  "oklch": {
    "l": 0.42755,
    "c": 0.17174,
    "h": 271.3
  },
  "luminance": 0.07148
}

Semantic roles & 50–950 ramp

primary

#313FAB

secondary

#C2BA75

accent

#CE49DF

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #313FAB

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

Preview Lab → · Contrast checker → · Palette generator →