#1B3A77#1B3A77

#1B3A77 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.2% C 0.111 H 262.1°. Best body text is #FFFFFF at 10.95:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A77
RGB	rgb(27, 58, 119)
HSL	hsl(220, 63%, 29%)
HSV	hsv(220, 77%, 47%)
CMYK	cmyk(77.3%, 51.3%, 0%, 53.3%)
CIE-LAB	lab(25.53, 11.92, -38.27)
CIE-LCH	lch(25.53, 40.08, 287.30°)
OKLab	oklab(36.21% -0.0152 -0.1099)
OKLCH	oklch(36.21% 0.111 262.1)
XYZ	xyz(5.2936, 4.5904, 18.0562)
Luminance	0.0459 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A77 #77581B

analogous

#1B6877 #1B3A77 #2A1B77

triadic

#1B3A77 #771B3A #3A771B

tetradic

#1B3A77 #771B68 #77581B #1B772A

square

#1B3A77 #771B68 #77581B #1B772A

split-complementary

#1B3A77 #772A1B #68771B

monochromatic

#060C19 #102245 #1B3A77 #2652A9 #3A6DD2

Accessibility & contrast

On white

10.95

#1B3A77 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1B3A77 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A77

10.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A77	#FFFFFF	#000000	##FFFFFF
##1B3A77	1.00	10.95	1.92	10.95
#FFFFFF	10.95	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#174179

Deuteranopia (green-blind)

#003976

Tritanopia (blue-blind)

#004952

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b3a77;
/* rgb */ color: rgb(27, 58, 119);
/* oklch */ color: oklch(36.2% 0.111 262.1);

Tailwind

colors: {
  custom: {
    50: '#666f9f',
    500: '#1b3a77',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a77;
$custom-light: #666f9f;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a77",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 119
  },
  "hsl": {
    "h": 219.783,
    "s": 63.014,
    "l": 28.627
  },
  "oklch": {
    "l": 0.36207,
    "c": 0.11098,
    "h": 262.1
  },
  "luminance": 0.04591
}

Semantic roles & 50–950 ramp

primary

#1B3A77

secondary

#AB8842

accent

#AF42E6

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3A77

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

Preview Lab → · Contrast checker → · Palette generator →