#1B3A79#1B3A79

#1B3A79 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.4% C 0.114 H 262.5°. Best body text is #FFFFFF at 10.89:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A79
RGB	rgb(27, 58, 121)
HSL	hsl(220, 64%, 29%)
HSV	hsv(220, 78%, 47%)
CMYK	cmyk(77.7%, 52.1%, 0%, 52.5%)
CIE-LAB	lab(25.68, 12.74, -39.30)
CIE-LCH	lch(25.68, 41.31, 287.96°)
OKLab	oklab(36.36% -0.0149 -0.113)
OKLCH	oklch(36.36% 0.114 262.5)
XYZ	xyz(5.4150, 4.6390, 18.6955)
Luminance	0.0464 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A79 #795A1B

analogous

#1B6979 #1B3A79 #2B1B79

triadic

#1B3A79 #791B3A #3A791B

tetradic

#1B3A79 #791B69 #795A1B #1B792B

square

#1B3A79 #791B69 #795A1B #1B792B

split-complementary

#1B3A79 #792B1B #69791B

monochromatic

#060C19 #102247 #1B3A79 #2652AB #3B6DD3

Accessibility & contrast

On white

10.89

#1B3A79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#1B3A79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A79

10.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A79	#FFFFFF	#000000	##FFFFFF
##1B3A79	1.00	10.89	1.93	10.89
#FFFFFF	10.89	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#14417B

Deuteranopia (green-blind)

#003978

Tritanopia (blue-blind)

#004953

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3a79;
/* rgb */ color: rgb(27, 58, 121);
/* oklch */ color: oklch(36.4% 0.114 262.5);

Tailwind

colors: {
  custom: {
    50: '#666fa0',
    500: '#1b3a79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a79;
$custom-light: #666fa0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a79",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 121
  },
  "hsl": {
    "h": 220.213,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.36365,
    "c": 0.11395,
    "h": 262.5
  },
  "luminance": 0.0464
}

Semantic roles & 50–950 ramp

primary

#1B3A79

secondary

#AD8A43

accent

#B041E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3A79

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

Preview Lab → · Contrast checker → · Palette generator →