#1B3D74#1B3D74

#1B3D74 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.7% C 0.103 H 259.6°. Best body text is #FFFFFF at 10.68:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D74
RGB	rgb(27, 61, 116)
HSL	hsl(217, 62%, 28%)
HSV	hsv(217, 77%, 45%)
CMYK	cmyk(76.7%, 47.4%, 0%, 54.5%)
CIE-LAB	lab(26.25, 8.58, -35.22)
CIE-LCH	lch(26.25, 36.25, 283.70°)
OKLab	oklab(36.69% -0.0185 -0.1009)
OKLCH	oklch(36.69% 0.103 259.6)
XYZ	xyz(5.2720, 4.8309, 17.1742)
Luminance	0.0483 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D74 #74521B

analogous

#1B6974 #1B3D74 #261B74

triadic

#1B3D74 #741B3D #3D741B

tetradic

#1B3D74 #741B69 #74521B #1B7426

square

#1B3D74 #741B69 #74521B #1B7426

split-complementary

#1B3D74 #74261B #69741B

monochromatic

#060D19 #0F2342 #1B3D74 #2757A6 #3973D1

Accessibility & contrast

On white

10.68

#1B3D74 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B3D74 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D74

10.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D74	#FFFFFF	#000000	##FFFFFF
##1B3D74	1.00	10.68	1.97	10.68
#FFFFFF	10.68	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#214276

Deuteranopia (green-blind)

#0E3A73

Tritanopia (blue-blind)

#004A52

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3d74;
/* rgb */ color: rgb(27, 61, 116);
/* oklch */ color: oklch(36.7% 0.103 259.6);

Tailwind

colors: {
  custom: {
    50: '#65729c',
    500: '#1b3d74',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d74;
$custom-light: #65729c;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d74",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 116
  },
  "hsl": {
    "h": 217.079,
    "s": 62.238,
    "l": 28.039
  },
  "oklch": {
    "l": 0.36686,
    "c": 0.10259,
    "h": 259.6
  },
  "luminance": 0.04831
}

Semantic roles & 50–950 ramp

primary

#1B3D74

secondary

#A98142

accent

#A742E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3D74

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

Preview Lab → · Contrast checker → · Palette generator →