#1B3774#1B3774

#1B3774 is a dark, moderate blue. Relative luminance 0.042; OKLCH L 35.3% C 0.111 H 263.3°. Best body text is #FFFFFF at 11.38:1 contrast (WCAG AA passes).

Color values

HEX	#1B3774
RGB	rgb(27, 55, 116)
HSL	hsl(221, 62%, 28%)
HSV	hsv(221, 77%, 45%)
CMYK	cmyk(76.7%, 52.6%, 0%, 54.5%)
CIE-LAB	lab(24.40, 12.81, -38.19)
CIE-LCH	lch(24.40, 40.28, 288.54°)
OKLab	oklab(35.27% -0.0129 -0.1098)
OKLCH	oklch(35.27% 0.111 263.3)
XYZ	xyz(4.9694, 4.2258, 17.0734)
Luminance	0.0423 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3774 #74581B

analogous

#1B6374 #1B3774 #2C1B74

triadic

#1B3774 #741B37 #37741B

tetradic

#1B3774 #741B63 #74581B #1B742C

square

#1B3774 #741B63 #74581B #1B742C

split-complementary

#1B3774 #742C1B #63741B

monochromatic

#060C19 #0F1F42 #1B3774 #274FA6 #3968D1

Accessibility & contrast

On white

11.38

#1B3774 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1B3774 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3774

11.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3774	#FFFFFF	#000000	##FFFFFF
##1B3774	1.00	11.38	1.85	11.38
#FFFFFF	11.38	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#123E76

Deuteranopia (green-blind)

#003673

Tritanopia (blue-blind)

#004650

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b3774;
/* rgb */ color: rgb(27, 55, 116);
/* oklch */ color: oklch(35.3% 0.111 263.3);

Tailwind

colors: {
  custom: {
    50: '#656d9c',
    500: '#1b3774',
    950: '#000000',
  },
}

SCSS

$custom: #1b3774;
$custom-light: #656d9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3774",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 116
  },
  "hsl": {
    "h": 221.124,
    "s": 62.238,
    "l": 28.039
  },
  "oklch": {
    "l": 0.35273,
    "c": 0.11051,
    "h": 263.3
  },
  "luminance": 0.04226
}

Semantic roles & 50–950 ramp

primary

#1B3774

secondary

#A98842

accent

#B242E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3774

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

Preview Lab → · Contrast checker → · Palette generator →