#1B1F74#1B1F74

#1B1F74 is a dark, vivid blue. Relative luminance 0.025; OKLCH L 30.4% C 0.142 H 272.2°. Best body text is #FFFFFF at 14.05:1 contrast (WCAG AA passes).

Color values

HEX	#1B1F74
RGB	rgb(27, 31, 116)
HSL	hsl(237, 62%, 28%)
HSV	hsv(237, 77%, 45%)
CMYK	cmyk(76.7%, 73.3%, 0%, 54.5%)
CIE-LAB	lab(17.80, 29.58, -48.96)
CIE-LCH	lch(17.80, 57.20, 301.14°)
OKLab	oklab(30.37% 0.0055 -0.1416)
OKLCH	oklch(30.37% 0.142 272.2)
XYZ	xyz(4.0933, 2.4735, 16.7813)
Luminance	0.0247 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1F74 #74701B

analogous

#1B4B74 #1B1F74 #431B74

triadic

#1B1F74 #741B1F #1F741B

tetradic

#1B1F74 #741B4B #74701B #1B7443

square

#1B1F74 #741B4B #74701B #1B7443

split-complementary

#1B1F74 #74431B #4B741B

monochromatic

#060719 #0F1242 #1B1F74 #272CA6 #393FD1

Accessibility & contrast

On white

14.05

#1B1F74 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.49

#1B1F74 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1F74

14.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1F74	#FFFFFF	#000000	##FFFFFF
##1B1F74	1.00	14.05	1.49	14.05
#FFFFFF	14.05	1.00	21.00	1.00
#000000	1.49	21.00	1.00	21.00
##FFFFFF	14.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003077

Deuteranopia (green-blind)

#002772

Tritanopia (blue-blind)

#003747

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #1b1f74;
/* rgb */ color: rgb(27, 31, 116);
/* oklch */ color: oklch(30.4% 0.142 272.2);

Tailwind

colors: {
  custom: {
    50: '#675b9d',
    500: '#1b1f74',
    950: '#000000',
  },
}

SCSS

$custom: #1b1f74;
$custom-light: #675b9d;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1f74",
  "rgb": {
    "r": 27,
    "g": 31,
    "b": 116
  },
  "hsl": {
    "h": 237.303,
    "s": 62.238,
    "l": 28.039
  },
  "oklch": {
    "l": 0.30365,
    "c": 0.14174,
    "h": 272.2
  },
  "luminance": 0.02474
}

Semantic roles & 50–950 ramp

primary

#1B1F74

secondary

#A9A442

accent

#DE42E5

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040E

muted

#7A797E

Preview Lab

Preview with #1B1F74

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

Preview Lab → · Contrast checker → · Palette generator →