#1B356B#1B356B

#1B356B is a dark, moderate blue. Relative luminance 0.038; OKLCH L 34.1% C 0.100 H 262.9°. Best body text is #FFFFFF at 11.88:1 contrast (WCAG AA passes).

Color values

HEX	#1B356B
RGB	rgb(27, 53, 107)
HSL	hsl(221, 60%, 26%)
HSV	hsv(221, 75%, 42%)
CMYK	cmyk(74.8%, 50.5%, 0%, 58%)
CIE-LAB	lab(23.14, 10.54, -34.46)
CIE-LCH	lch(23.14, 36.04, 287.01°)
OKLab	oklab(34.09% -0.0123 -0.0988)
OKLCH	oklch(34.09% 0.1 262.9)
XYZ	xyz(4.3780, 3.8403, 14.4176)
Luminance	0.0384 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B356B #6B511B

analogous

#1B5D6B #1B356B #291B6B

triadic

#1B356B #6B1B35 #356B1B

tetradic

#1B356B #6B1B5D #6B511B #1B6B29

square

#1B356B #6B1B5D #6B511B #1B6B29

split-complementary

#1B356B #6B291B #5D6B1B

monochromatic

#060C18 #0F1D3A #1B356B #274D9C #3566CC

Accessibility & contrast

On white

11.88

#1B356B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1B356B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B356B

11.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B356B	#FFFFFF	#000000	##FFFFFF
##1B356B	1.00	11.88	1.77	11.88
#FFFFFF	11.88	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#183B6D

Deuteranopia (green-blind)

#04346A

Tritanopia (blue-blind)

#00424A

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b356b;
/* rgb */ color: rgb(27, 53, 107);
/* oklch */ color: oklch(34.1% 0.100 262.9);

Tailwind

colors: {
  custom: {
    50: '#636b96',
    500: '#1b356b',
    950: '#000000',
  },
}

SCSS

$custom: #1b356b;
$custom-light: #636b96;
$custom-dark: #000000;

JSON

{
  "hex": "#1b356b",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 107
  },
  "hsl": {
    "h": 220.5,
    "s": 59.701,
    "l": 26.275
  },
  "oklch": {
    "l": 0.34094,
    "c": 0.0996,
    "h": 262.9
  },
  "luminance": 0.03841
}

Semantic roles & 50–950 ramp

primary

#1B356B

secondary

#A08142

accent

#B045E3

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060D

muted

#7A7A7E

Preview Lab

Preview with #1B356B

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

Preview Lab → · Contrast checker → · Palette generator →