#1B356F#1B356F

#1B356F is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.4% C 0.106 H 263.6°. Best body text is #FFFFFF at 11.76:1 contrast (WCAG AA passes).

Color values

HEX	#1B356F
RGB	rgb(27, 53, 111)
HSL	hsl(221, 61%, 27%)
HSV	hsv(221, 76%, 44%)
CMYK	cmyk(75.7%, 52.3%, 0%, 56.5%)
CIE-LAB	lab(23.43, 12.18, -36.57)
CIE-LCH	lch(23.43, 38.54, 288.42°)
OKLab	oklab(34.41% -0.0117 -0.105)
OKLCH	oklch(34.41% 0.106 263.6)
XYZ	xyz(4.5933, 3.9264, 15.5516)
Luminance	0.0393 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B356F #6F551B

analogous

#1B5F6F #1B356F #2B1B6F

triadic

#1B356F #6F1B35 #356F1B

tetradic

#1B356F #6F1B5F #6F551B #1B6F2B

square

#1B356F #6F1B5F #6F551B #1B6F2B

split-complementary

#1B356F #6F2B1B #5F6F1B

monochromatic

#060C19 #0F1D3E #1B356F #274DA0 #3665CE

Accessibility & contrast

On white

11.76

#1B356F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1B356F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B356F

11.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B356F	#FFFFFF	#000000	##FFFFFF
##1B356F	1.00	11.76	1.79	11.76
#FFFFFF	11.76	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#133C71

Deuteranopia (green-blind)

#00346E

Tritanopia (blue-blind)

#00434C

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b356f;
/* rgb */ color: rgb(27, 53, 111);
/* oklch */ color: oklch(34.4% 0.106 263.6);

Tailwind

colors: {
  custom: {
    50: '#646b99',
    500: '#1b356f',
    950: '#000000',
  },
}

SCSS

$custom: #1b356f;
$custom-light: #646b99;
$custom-dark: #000000;

JSON

{
  "hex": "#1b356f",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 111
  },
  "hsl": {
    "h": 221.429,
    "s": 60.87,
    "l": 27.059
  },
  "oklch": {
    "l": 0.34409,
    "c": 0.10568,
    "h": 263.6
  },
  "luminance": 0.03927
}

Semantic roles & 50–950 ramp

primary

#1B356F

secondary

#A48642

accent

#B244E4

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B356F

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

Preview Lab → · Contrast checker → · Palette generator →