#1B305A#1B305A

#1B305A is a dark, moderate blue. Relative luminance 0.031; OKLCH L 31.6% C 0.080 H 262.7°. Best body text is #FFFFFF at 12.99:1 contrast (WCAG AA passes).

Color values

HEX	#1B305A
RGB	rgb(27, 48, 90)
HSL	hsl(220, 54%, 23%)
HSV	hsv(220, 70%, 35%)
CMYK	cmyk(70%, 46.7%, 0%, 64.7%)
CIE-LAB	lab(20.38, 7.19, -27.78)
CIE-LCH	lch(20.38, 28.69, 284.50°)
OKLab	oklab(31.6% -0.0102 -0.0793)
OKLCH	oklch(31.6% 0.08 262.7)
XYZ	xyz(3.3538, 3.0848, 10.0896)
Luminance	0.0308 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B305A #5A451B

analogous

#1B4F5A #1B305A #251B5A

triadic

#1B305A #5A1B30 #305A1B

tetradic

#1B305A #5A1B4F #5A451B #1B5A25

square

#1B305A #5A1B4F #5A451B #1B5A25

split-complementary

#1B305A #5A251B #4F5A1B

monochromatic

#070D18 #0D172B #1B305A #294989 #3762B8

Accessibility & contrast

On white

12.99

#1B305A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.62

#1B305A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B305A

12.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B305A	#FFFFFF	#000000	##FFFFFF
##1B305A	1.00	12.99	1.62	12.99
#FFFFFF	12.99	1.00	21.00	1.00
#000000	1.62	21.00	1.00	21.00
##FFFFFF	12.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C345C

Deuteranopia (green-blind)

#122E59

Tritanopia (blue-blind)

#003A40

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b305a;
/* rgb */ color: rgb(27, 48, 90);
/* oklch */ color: oklch(31.6% 0.080 262.7);

Tailwind

colors: {
  custom: {
    50: '#5f6789',
    500: '#1b305a',
    950: '#000000',
  },
}

SCSS

$custom: #1b305a;
$custom-light: #5f6789;
$custom-dark: #000000;

JSON

{
  "hex": "#1b305a",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 90
  },
  "hsl": {
    "h": 220,
    "s": 53.846,
    "l": 22.941
  },
  "oklch": {
    "l": 0.31598,
    "c": 0.07993,
    "h": 262.7
  },
  "luminance": 0.03085
}

Semantic roles & 50–950 ramp

primary

#1B305A

secondary

#907641

accent

#AC4BDD

background

#F5F6F8

surface

#EAEBF0

border

#C6C6CB

text

#05060B

muted

#797A7C

Preview Lab

Preview with #1B305A

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

Preview Lab → · Contrast checker → · Palette generator →