#1B3A7B#1B3A7B

#1B3A7B is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.5% C 0.117 H 262.8°. Best body text is #FFFFFF at 10.84:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A7B
RGB	rgb(27, 58, 123)
HSL	hsl(221, 64%, 29%)
HSV	hsv(221, 78%, 48%)
CMYK	cmyk(78%, 52.8%, 0%, 51.8%)
CIE-LAB	lab(25.83, 13.55, -40.32)
CIE-LCH	lch(25.83, 42.54, 288.58°)
OKLab	oklab(36.53% -0.0146 -0.116)
OKLCH	oklch(36.53% 0.117 262.8)
XYZ	xyz(5.5389, 4.6886, 19.3481)
Luminance	0.0469 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A7B #7B5C1B

analogous

#1B6A7B #1B3A7B #2C1B7B

triadic

#1B3A7B #7B1B3A #3A7B1B

tetradic

#1B3A7B #7B1B6A #7B5C1B #1B7B2C

square

#1B3A7B #7B1B6A #7B5C1B #1B7B2C

split-complementary

#1B3A7B #7B2C1B #6A7B1B

monochromatic

#060C19 #102249 #1B3A7B #2652AD #3C6DD4

Accessibility & contrast

On white

10.84

#1B3A7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1B3A7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A7B

10.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A7B	#FFFFFF	#000000	##FFFFFF
##1B3A7B	1.00	10.84	1.94	10.84
#FFFFFF	10.84	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#11427D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3a7b;
/* rgb */ color: rgb(27, 58, 123);
/* oklch */ color: oklch(36.5% 0.117 262.8);

Tailwind

colors: {
  custom: {
    50: '#676fa2',
    500: '#1b3a7b',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a7b;
$custom-light: #676fa2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a7b",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 123
  },
  "hsl": {
    "h": 220.625,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.36525,
    "c": 0.11691,
    "h": 262.8
  },
  "luminance": 0.04689
}

Semantic roles & 50–950 ramp

primary

#1B3A7B

secondary

#AF8C43

accent

#B141E7

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3A7B

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

Preview Lab → · Contrast checker → · Palette generator →