#1B2573#1B2573

#1B2573 is a dark, vivid blue. Relative luminance 0.028; OKLCH L 31.4% C 0.133 H 270.7°. Best body text is #FFFFFF at 13.47:1 contrast (WCAG AA passes).

Color values

HEX	#1B2573
RGB	rgb(27, 37, 115)
HSL	hsl(233, 62%, 28%)
HSV	hsv(233, 77%, 45%)
CMYK	cmyk(76.5%, 67.8%, 0%, 54.9%)
CIE-LAB	lab(19.20, 25.16, -46.02)
CIE-LCH	lch(19.20, 52.44, 298.66°)
OKLab	oklab(31.35% 0.0017 -0.133)
OKLCH	oklch(31.35% 0.133 270.7)
XYZ	xyz(4.2070, 2.7935, 16.5338)
Luminance	0.0279 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2573 #73691B

analogous

#1B5173 #1B2573 #3D1B73

triadic

#1B2573 #731B25 #25731B

tetradic

#1B2573 #731B51 #73691B #1B733D

square

#1B2573 #731B51 #73691B #1B733D

split-complementary

#1B2573 #733D1B #51731B

monochromatic

#060819 #0F1541 #1B2573 #2735A5 #3849D0

Accessibility & contrast

On white

13.47

#1B2573 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#1B2573 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2573

13.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2573	#FFFFFF	#000000	##FFFFFF
##1B2573	1.00	13.47	1.56	13.47
#FFFFFF	13.47	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003375

Deuteranopia (green-blind)

#002A72

Tritanopia (blue-blind)

#003A48

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b2573;
/* rgb */ color: rgb(27, 37, 115);
/* oklch */ color: oklch(31.4% 0.133 270.7);

Tailwind

colors: {
  custom: {
    50: '#665f9c',
    500: '#1b2573',
    950: '#000000',
  },
}

SCSS

$custom: #1b2573;
$custom-light: #665f9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2573",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 115
  },
  "hsl": {
    "h": 233.182,
    "s": 61.972,
    "l": 27.843
  },
  "oklch": {
    "l": 0.3135,
    "c": 0.13303,
    "h": 270.7
  },
  "luminance": 0.02794
}

Semantic roles & 50–950 ramp

primary

#1B2573

secondary

#A89C42

accent

#D343E5

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040E

muted

#7A797E

Preview Lab

Preview with #1B2573

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

Preview Lab → · Contrast checker → · Palette generator →