#1B305F#1B305F

#1B305F is a dark, moderate blue. Relative luminance 0.032; OKLCH L 32.0% C 0.088 H 264.0°. Best body text is #FFFFFF at 12.85:1 contrast (WCAG AA passes).

Color values

HEX	#1B305F
RGB	rgb(27, 48, 95)
HSL	hsl(221, 56%, 24%)
HSV	hsv(221, 72%, 37%)
CMYK	cmyk(71.6%, 49.5%, 0%, 62.7%)
CIE-LAB	lab(20.72, 9.22, -30.53)
CIE-LCH	lch(20.72, 31.89, 286.80°)
OKLab	oklab(31.97% -0.0092 -0.0874)
OKLCH	oklch(31.97% 0.088 264)
XYZ	xyz(3.5738, 3.1728, 11.2483)
Luminance	0.0317 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B305F #5F4A1B

analogous

#1B525F #1B305F #281B5F

triadic

#1B305F #5F1B30 #305F1B

tetradic

#1B305F #5F1B52 #5F4A1B #1B5F28

square

#1B305F #5F1B52 #5F4A1B #1B5F28

split-complementary

#1B305F #5F281B #525F1B

monochromatic

#070C18 #0D182F #1B305F #29488F #3660BE

Accessibility & contrast

On white

12.85

#1B305F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.63

#1B305F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B305F

12.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B305F	#FFFFFF	#000000	##FFFFFF
##1B305F	1.00	12.85	1.63	12.85
#FFFFFF	12.85	1.00	21.00	1.00
#000000	1.63	21.00	1.00	21.00
##FFFFFF	12.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#183561

Deuteranopia (green-blind)

#0B2F5E

Tritanopia (blue-blind)

#003B42

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1b305f;
/* rgb */ color: rgb(27, 48, 95);
/* oklch */ color: oklch(32.0% 0.088 264.0);

Tailwind

colors: {
  custom: {
    50: '#60678d',
    500: '#1b305f',
    950: '#000000',
  },
}

SCSS

$custom: #1b305f;
$custom-light: #60678d;
$custom-dark: #000000;

JSON

{
  "hex": "#1b305f",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 95
  },
  "hsl": {
    "h": 221.471,
    "s": 55.738,
    "l": 23.922
  },
  "oklch": {
    "l": 0.31972,
    "c": 0.08784,
    "h": 264
  },
  "luminance": 0.03173
}

Semantic roles & 50–950 ramp

primary

#1B305F

secondary

#957B41

accent

#B149DF

background

#F5F6F8

surface

#EAEBF0

border

#C6C6CB

text

#05060C

muted

#797A7D

Preview Lab

Preview with #1B305F

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

Preview Lab → · Contrast checker → · Palette generator →