#1B2571#1B2571

#1B2571 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.1% C 0.130 H 270.8°. Best body text is #FFFFFF at 13.55:1 contrast (WCAG AA passes).

Color values

HEX	#1B2571
RGB	rgb(27, 37, 113)
HSL	hsl(233, 61%, 27%)
HSV	hsv(233, 76%, 44%)
CMYK	cmyk(76.1%, 67.3%, 0%, 55.7%)
CIE-LAB	lab(19.00, 24.37, -45.04)
CIE-LCH	lch(19.00, 51.21, 298.42°)
OKLab	oklab(31.15% 0.0018 -0.1302)
OKLCH	oklch(31.15% 0.13 270.8)
XYZ	xyz(4.0932, 2.7480, 15.9343)
Luminance	0.0275 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2571 #71671B

analogous

#1B5071 #1B2571 #3C1B71

triadic

#1B2571 #711B25 #25711B

tetradic

#1B2571 #711B50 #71671B #1B713C

square

#1B2571 #711B50 #71671B #1B713C

split-complementary

#1B2571 #713C1B #50711B

monochromatic

#060819 #0F1540 #1B2571 #2735A2 #3749CF

Accessibility & contrast

On white

13.55

#1B2571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#1B2571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2571

13.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2571	#FFFFFF	#000000	##FFFFFF
##1B2571	1.00	13.55	1.55	13.55
#FFFFFF	13.55	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003273

Deuteranopia (green-blind)

#002A70

Tritanopia (blue-blind)

#003947

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1b2571;
/* rgb */ color: rgb(27, 37, 113);
/* oklch */ color: oklch(31.1% 0.130 270.8);

Tailwind

colors: {
  custom: {
    50: '#665f9b',
    500: '#1b2571',
    950: '#000000',
  },
}

SCSS

$custom: #1b2571;
$custom-light: #665f9b;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2571",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 113
  },
  "hsl": {
    "h": 233.023,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.3115,
    "c": 0.13018,
    "h": 270.8
  },
  "luminance": 0.02748
}

Semantic roles & 50–950 ramp

primary

#1B2571

secondary

#A69A42

accent

#D243E5

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#06040E

muted

#7A797E

Preview Lab

Preview with #1B2571

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

Preview Lab → · Contrast checker → · Palette generator →