#1B2971#1B2971

#1B2971 is a dark, vivid blue. Relative luminance 0.030; OKLCH L 31.9% C 0.125 H 269.4°. Best body text is #FFFFFF at 13.11:1 contrast (WCAG AA passes).

Color values

HEX	#1B2971
RGB	rgb(27, 41, 113)
HSL	hsl(230, 61%, 27%)
HSV	hsv(230, 76%, 44%)
CMYK	cmyk(76.1%, 63.7%, 0%, 55.7%)
CIE-LAB	lab(20.09, 21.57, -43.27)
CIE-LCH	lch(20.09, 48.35, 296.49°)
OKLab	oklab(31.95% -0.0012 -0.1249)
OKLCH	oklch(31.95% 0.125 269.4)
XYZ	xyz(4.2245, 3.0107, 15.9781)
Luminance	0.0301 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2971 #71631B

analogous

#1B5471 #1B2971 #381B71

triadic

#1B2971 #711B29 #29711B

tetradic

#1B2971 #711B54 #71631B #1B7138

square

#1B2971 #711B54 #71631B #1B7138

split-complementary

#1B2971 #71381B #54711B

monochromatic

#060919 #0F1740 #1B2971 #273BA2 #3750CF

Accessibility & contrast

On white

13.11

#1B2971 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.60

#1B2971 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2971

13.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2971	#FFFFFF	#000000	##FFFFFF
##1B2971	1.00	13.11	1.60	13.11
#FFFFFF	13.11	1.00	21.00	1.00
#000000	1.60	21.00	1.00	21.00
##FFFFFF	13.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003573

Deuteranopia (green-blind)

#002D70

Tritanopia (blue-blind)

#003B48

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b2971;
/* rgb */ color: rgb(27, 41, 113);
/* oklch */ color: oklch(31.9% 0.125 269.4);

Tailwind

colors: {
  custom: {
    50: '#65629a',
    500: '#1b2971',
    950: '#000000',
  },
}

SCSS

$custom: #1b2971;
$custom-light: #65629a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2971",
  "rgb": {
    "r": 27,
    "g": 41,
    "b": 113
  },
  "hsl": {
    "h": 230.233,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.31947,
    "c": 0.12495,
    "h": 269.4
  },
  "luminance": 0.03011
}

Semantic roles & 50–950 ramp

primary

#1B2971

secondary

#A69642

accent

#CA43E5

background

#F6F5F9

surface

#EBEAF2

border

#C6C6CC

text

#06050E

muted

#7A797E

Preview Lab

Preview with #1B2971

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

Preview Lab → · Contrast checker → · Palette generator →