#1B307D#1B307D

#1B307D is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.5% C 0.133 H 267.2°. Best body text is #FFFFFF at 11.89:1 contrast (WCAG AA passes).

Color values

HEX	#1B307D
RGB	rgb(27, 48, 125)
HSL	hsl(227, 64%, 30%)
HSV	hsv(227, 78%, 49%)
CMYK	cmyk(78.4%, 61.6%, 0%, 51%)
CIE-LAB	lab(23.09, 21.43, -46.03)
CIE-LCH	lch(23.09, 50.77, 294.97°)
OKLab	oklab(34.51% -0.0064 -0.1329)
OKLCH	oklch(34.51% 0.133 267.2)
XYZ	xyz(5.2093, 3.8270, 19.8622)
Luminance	0.0383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B307D #7D681B

analogous

#1B617D #1B307D #371B7D

triadic

#1B307D #7D1B30 #307D1B

tetradic

#1B307D #7D1B61 #7D681B #1B7D37

square

#1B307D #7D1B61 #7D681B #1B7D37

split-complementary

#1B307D #7D371B #617D1B

monochromatic

#050A19 #101D4B #1B307D #2643AF #3D5ED5

Accessibility & contrast

On white

11.89

#1B307D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1B307D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B307D

11.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B307D	#FFFFFF	#000000	##FFFFFF
##1B307D	1.00	11.89	1.77	11.89
#FFFFFF	11.89	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C80

Deuteranopia (green-blind)

#00337C

Tritanopia (blue-blind)

#004351

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b307d;
/* rgb */ color: rgb(27, 48, 125);
/* oklch */ color: oklch(34.5% 0.133 267.2);

Tailwind

colors: {
  custom: {
    50: '#6868a3',
    500: '#1b307d',
    950: '#000000',
  },
}

SCSS

$custom: #1b307d;
$custom-light: #6868a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b307d",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 125
  },
  "hsl": {
    "h": 227.143,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.34511,
    "c": 0.1331,
    "h": 267.2
  },
  "luminance": 0.03828
}

Semantic roles & 50–950 ramp

primary

#1B307D

secondary

#B19943

accent

#C440E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B307D

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

Preview Lab → · Contrast checker → · Palette generator →