#1B3B79#1B3B79

#1B3B79 is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.6% C 0.113 H 261.9°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B3B79
RGB	rgb(27, 59, 121)
HSL	hsl(220, 64%, 29%)
HSV	hsv(220, 78%, 47%)
CMYK	cmyk(77.7%, 51.2%, 0%, 52.5%)
CIE-LAB	lab(25.98, 12.03, -38.81)
CIE-LCH	lch(25.98, 40.63, 287.22°)
OKLab	oklab(36.6% -0.0158 -0.1115)
OKLCH	oklch(36.6% 0.113 261.9)
XYZ	xyz(5.4659, 4.7408, 18.7125)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3B79 #79591B

analogous

#1B6A79 #1B3B79 #2A1B79

triadic

#1B3B79 #791B3B #3B791B

tetradic

#1B3B79 #791B6A #79591B #1B792A

square

#1B3B79 #791B6A #79591B #1B792A

split-complementary

#1B3B79 #792A1B #6A791B

monochromatic

#060C19 #102347 #1B3B79 #2653AB #3B6FD3

Accessibility & contrast

On white

10.78

#1B3B79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1B3B79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3B79

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3B79	#FFFFFF	#000000	##FFFFFF
##1B3B79	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#17427B

Deuteranopia (green-blind)

#003978

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3b79;
/* rgb */ color: rgb(27, 59, 121);
/* oklch */ color: oklch(36.6% 0.113 261.9);

Tailwind

colors: {
  custom: {
    50: '#6670a0',
    500: '#1b3b79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3b79;
$custom-light: #6670a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3b79",
  "rgb": {
    "r": 27,
    "g": 59,
    "b": 121
  },
  "hsl": {
    "h": 219.574,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.36596,
    "c": 0.11263,
    "h": 261.9
  },
  "luminance": 0.04741
}

Semantic roles & 50–950 ramp

primary

#1B3B79

secondary

#AD8943

accent

#AE41E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3B79

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

Preview Lab → · Contrast checker → · Palette generator →