#1B3A7D#1B3A7D

#1B3A7D is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.7% C 0.120 H 263.1°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A7D
RGB	rgb(27, 58, 125)
HSL	hsl(221, 64%, 30%)
HSV	hsv(221, 78%, 49%)
CMYK	cmyk(78.4%, 53.6%, 0%, 51%)
CIE-LAB	lab(25.98, 14.37, -41.34)
CIE-LCH	lch(25.98, 43.77, 289.17°)
OKLab	oklab(36.69% -0.0144 -0.119)
OKLCH	oklch(36.69% 0.12 263.1)
XYZ	xyz(5.6654, 4.7392, 20.0142)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A7D #7D5E1B

analogous

#1B6B7D #1B3A7D #2D1B7D

triadic

#1B3A7D #7D1B3A #3A7D1B

tetradic

#1B3A7D #7D1B6B #7D5E1B #1B7D2D

square

#1B3A7D #7D1B6B #7D5E1B #1B7D2D

split-complementary

#1B3A7D #7D2D1B #6B7D1B

monochromatic

#050C19 #10234B #1B3A7D #2651AF #3D6DD5

Accessibility & contrast

On white

10.78

#1B3A7D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1B3A7D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A7D

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A7D	#FFFFFF	#000000	##FFFFFF
##1B3A7D	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)

#0D427F

Deuteranopia (green-blind)

#00397C

Tritanopia (blue-blind)

#004A55

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3a7d;
/* rgb */ color: rgb(27, 58, 125);
/* oklch */ color: oklch(36.7% 0.120 263.1);

Tailwind

colors: {
  custom: {
    50: '#676fa3',
    500: '#1b3a7d',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a7d;
$custom-light: #676fa3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a7d",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 125
  },
  "hsl": {
    "h": 221.02,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.36686,
    "c": 0.11984,
    "h": 263.1
  },
  "luminance": 0.0474
}

Semantic roles & 50–950 ramp

primary

#1B3A7D

secondary

#B18E43

accent

#B340E7

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3A7D

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

Preview Lab → · Contrast checker → · Palette generator →