#1B237C#1B237C

#1B237C is a dark, vivid blue. Relative luminance 0.029; OKLCH L 31.9% C 0.148 H 270.8°. Best body text is #FFFFFF at 13.31:1 contrast (WCAG AA passes).

Color values

HEX	#1B237C
RGB	rgb(27, 35, 124)
HSL	hsl(235, 64%, 30%)
HSV	hsv(235, 78%, 49%)
CMYK	cmyk(78.2%, 71.8%, 0%, 51.4%)
CIE-LAB	lab(19.60, 29.96, -51.12)
CIE-LCH	lch(19.60, 59.25, 300.37°)
OKLab	oklab(31.92% 0.0021 -0.1479)
OKLCH	oklch(31.92% 0.148 270.8)
XYZ	xyz(4.6899, 2.8898, 19.3755)
Luminance	0.0289 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B237C #7C741B

analogous

#1B537C #1B237C #441B7C

triadic

#1B237C #7C1B23 #237C1B

tetradic

#1B237C #7C1B53 #7C741B #1B7C44

square

#1B237C #7C1B53 #7C741B #1B7C44

split-complementary

#1B237C #7C441B #537C1B

monochromatic

#050719 #10154A #1B237C #2631AE #3D49D5

Accessibility & contrast

On white

13.31

#1B237C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.58

#1B237C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B237C

13.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B237C	#FFFFFF	#000000	##FFFFFF
##1B237C	1.00	13.31	1.58	13.31
#FFFFFF	13.31	1.00	21.00	1.00
#000000	1.58	21.00	1.00	21.00
##FFFFFF	13.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347F

Deuteranopia (green-blind)

#002B7A

Tritanopia (blue-blind)

#003C4C

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b237c;
/* rgb */ color: rgb(27, 35, 124);
/* oklch */ color: oklch(31.9% 0.148 270.8);

Tailwind

colors: {
  custom: {
    50: '#695ea3',
    500: '#1b237c',
    950: '#000000',
  },
}

SCSS

$custom: #1b237c;
$custom-light: #695ea3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b237c",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 124
  },
  "hsl": {
    "h": 235.052,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.31915,
    "c": 0.14796,
    "h": 270.8
  },
  "luminance": 0.0289
}

Semantic roles & 50–950 ramp

primary

#1B237C

secondary

#B0A743

accent

#D941E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B237C

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

Preview Lab → · Contrast checker → · Palette generator →