#1B3D71#1B3D71

#1B3D71 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.5% C 0.098 H 258.8°. Best body text is #FFFFFF at 10.75:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D71
RGB	rgb(27, 61, 113)
HSL	hsl(216, 61%, 27%)
HSV	hsv(216, 76%, 44%)
CMYK	cmyk(76.1%, 46%, 0%, 55.7%)
CIE-LAB	lab(26.05, 7.36, -33.64)
CIE-LCH	lch(26.05, 34.43, 282.34°)
OKLab	oklab(36.47% -0.0191 -0.0963)
OKLCH	oklch(36.47% 0.098 258.8)
XYZ	xyz(5.1003, 4.7622, 16.2700)
Luminance	0.0476 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D71 #714F1B

analogous

#1B6871 #1B3D71 #241B71

triadic

#1B3D71 #711B3D #3D711B

tetradic

#1B3D71 #711B68 #714F1B #1B7124

square

#1B3D71 #711B68 #714F1B #1B7124

split-complementary

#1B3D71 #71241B #68711B

monochromatic

#060D19 #0F2240 #1B3D71 #2758A2 #3773CF

Accessibility & contrast

On white

10.75

#1B3D71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1B3D71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D71

10.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D71	#FFFFFF	#000000	##FFFFFF
##1B3D71	1.00	10.75	1.95	10.75
#FFFFFF	10.75	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#234273

Deuteranopia (green-blind)

#133A70

Tritanopia (blue-blind)

#004951

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3d71;
/* rgb */ color: rgb(27, 61, 113);
/* oklch */ color: oklch(36.5% 0.098 258.8);

Tailwind

colors: {
  custom: {
    50: '#64729a',
    500: '#1b3d71',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d71;
$custom-light: #64729a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d71",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 113
  },
  "hsl": {
    "h": 216.279,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.36466,
    "c": 0.09814,
    "h": 258.8
  },
  "luminance": 0.04763
}

Semantic roles & 50–950 ramp

primary

#1B3D71

secondary

#A67E42

accent

#A543E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3D71

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

Preview Lab → · Contrast checker → · Palette generator →