#1B2583#1B2583

#1B2583 is a dark, vivid blue. Relative luminance 0.032; OKLCH L 33.0% C 0.155 H 270.1°. Best body text is #FFFFFF at 12.81:1 contrast (WCAG AA passes).

Color values

HEX	#1B2583
RGB	rgb(27, 37, 131)
HSL	hsl(234, 66%, 31%)
HSV	hsv(234, 79%, 51%)
CMYK	cmyk(79.4%, 71.8%, 0%, 48.6%)
CIE-LAB	lab(20.81, 31.27, -53.56)
CIE-LCH	lch(20.81, 62.03, 300.28°)
OKLab	oklab(33.01% 0.0002 -0.1551)
OKLCH	oklch(33.01% 0.155 270.1)
XYZ	xyz(5.2089, 3.1943, 21.8104)
Luminance	0.0319 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2583 #83791B

analogous

#1B5983 #1B2583 #451B83

triadic

#1B2583 #831B25 #25831B

tetradic

#1B2583 #831B59 #83791B #1B8345

square

#1B2583 #831B59 #83791B #1B8345

split-complementary

#1B2583 #83451B #59831B

monochromatic

#06081E #111750 #1B2583 #2533B6 #414FD8

Accessibility & contrast

On white

12.81

#1B2583 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.64

#1B2583 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2583

12.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2583	#FFFFFF	#000000	##FFFFFF
##1B2583	1.00	12.81	1.64	12.81
#FFFFFF	12.81	1.00	21.00	1.00
#000000	1.64	21.00	1.00	21.00
##FFFFFF	12.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003786

Deuteranopia (green-blind)

#002D81

Tritanopia (blue-blind)

#003F51

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1b2583;
/* rgb */ color: rgb(27, 37, 131);
/* oklch */ color: oklch(33.0% 0.155 270.1);

Tailwind

colors: {
  custom: {
    50: '#6a60a8',
    500: '#1b2583',
    950: '#000000',
  },
}

SCSS

$custom: #1b2583;
$custom-light: #6a60a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2583",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 131
  },
  "hsl": {
    "h": 234.231,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.33008,
    "c": 0.15507,
    "h": 270.1
  },
  "luminance": 0.03195
}

Semantic roles & 50–950 ramp

primary

#1B2583

secondary

#B6AB43

accent

#D83FE9

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080510

muted

#7A797F

Preview Lab

Preview with #1B2583

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

Preview Lab → · Contrast checker → · Palette generator →