#313BB4#313BB4

#313BB4 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.9% C 0.188 H 271.9°. Best body text is #FFFFFF at 8.69:1 contrast (WCAG AA passes).

Color values

HEX	#313BB4
RGB	rgb(49, 59, 180)
HSL	hsl(235, 57%, 45%)
HSV	hsv(235, 73%, 71%)
CMYK	cmyk(72.8%, 67.2%, 0%, 29.4%)
CIE-LAB	lab(31.98, 37.35, -65.09)
CIE-LCH	lch(31.98, 75.05, 299.85°)
OKLab	oklab(42.88% 0.0061 -0.1882)
OKLCH	oklch(42.88% 0.188 271.9)
XYZ	xyz(11.0660, 7.0751, 43.9536)
Luminance	0.0708 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#313BB4 #B4AA31

analogous

#317CB4 #313BB4 #6931B4

triadic

#313BB4 #B4313B #3BB431

tetradic

#313BB4 #B4317C #B4AA31 #31B469

square

#313BB4 #B4317C #B4AA31 #31B469

split-complementary

#313BB4 #B46931 #7CB431

monochromatic

#171B54 #242B84 #313BB4 #525CD0 #8289DD

Accessibility & contrast

On white

8.69

#313BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.42

#313BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #313BB4

8.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##313BB4	#FFFFFF	#000000	##FFFFFF
##313BB4	1.00	8.69	2.42	8.69
#FFFFFF	8.69	1.00	21.00	1.00
#000000	2.42	21.00	1.00	21.00
##FFFFFF	8.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B8

Deuteranopia (green-blind)

#0045B2

Tritanopia (blue-blind)

#005B72

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #313bb4;
/* rgb */ color: rgb(49, 59, 180);
/* oklch */ color: oklch(42.9% 0.188 271.9);

Tailwind

colors: {
  custom: {
    50: '#7c71cc',
    500: '#313bb4',
    950: '#000000',
  },
}

SCSS

$custom: #313bb4;
$custom-light: #7c71cc;
$custom-dark: #000000;

JSON

{
  "hex": "#313bb4",
  "rgb": {
    "r": 49,
    "g": 59,
    "b": 180
  },
  "hsl": {
    "h": 235.42,
    "s": 57.205,
    "l": 44.902
  },
  "oklch": {
    "l": 0.42882,
    "c": 0.1883,
    "h": 271.9
  },
  "luminance": 0.07076
}

Semantic roles & 50–950 ramp

primary

#313BB4

secondary

#C6C07B

accent

#D547E0

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #313BB4

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

Preview Lab → · Contrast checker → · Palette generator →