#1B309E#1B309E

#1B309E is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.7% C 0.178 H 267.6°. Best body text is #FFFFFF at 10.70:1 contrast (WCAG AA passes).

Color values

HEX	#1B309E
RGB	rgb(27, 48, 158)
HSL	hsl(230, 71%, 36%)
HSV	hsv(230, 83%, 62%)
CMYK	cmyk(82.9%, 69.6%, 0%, 38%)
CIE-LAB	lab(26.20, 34.25, -61.40)
CIE-LCH	lch(26.20, 70.31, 299.15°)
OKLab	oklab(37.75% -0.0076 -0.1779)
OKLCH	oklch(37.75% 0.178 267.6)
XYZ	xyz(7.6784, 4.8146, 32.8658)
Luminance	0.0482 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B309E #9E891B

analogous

#1B729E #1B309E #481B9E

triadic

#1B309E #9E1B30 #309E1B

tetradic

#1B309E #9E1B72 #9E891B #1B9E48

square

#1B309E #9E1B72 #9E891B #1B9E48

split-complementary

#1B309E #9E481B #729E1B

monochromatic

#091035 #12206A #1B309E #2440D2 #5269E1

Accessibility & contrast

On white

10.70

#1B309E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1B309E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B309E

10.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B309E	#FFFFFF	#000000	##FFFFFF
##1B309E	1.00	10.70	1.96	10.70
#FFFFFF	10.70	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0044A1

Deuteranopia (green-blind)

#00389C

Tritanopia (blue-blind)

#004E63

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b309e;
/* rgb */ color: rgb(27, 48, 158);
/* oklch */ color: oklch(37.7% 0.178 267.6);

Tailwind

colors: {
  custom: {
    50: '#7168bc',
    500: '#1b309e',
    950: '#000000',
  },
}

SCSS

$custom: #1b309e;
$custom-light: #7168bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b309e",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 158
  },
  "hsl": {
    "h": 230.382,
    "s": 70.811,
    "l": 36.275
  },
  "oklch": {
    "l": 0.37749,
    "c": 0.17807,
    "h": 267.6
  },
  "luminance": 0.04816
}

Semantic roles & 50–950 ramp

primary

#1B309E

secondary

#C4B251

accent

#D13AEE

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1B309E

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

Preview Lab → · Contrast checker → · Palette generator →