#1B237B#1B237B

#1B237B is a dark, vivid blue. Relative luminance 0.029; OKLCH L 31.8% C 0.147 H 270.9°. Best body text is #FFFFFF at 13.35:1 contrast (WCAG AA passes).

Color values

HEX	#1B237B
RGB	rgb(27, 35, 123)
HSL	hsl(235, 64%, 29%)
HSV	hsv(235, 78%, 48%)
CMYK	cmyk(78%, 71.5%, 0%, 51.8%)
CIE-LAB	lab(19.49, 29.58, -50.65)
CIE-LCH	lch(19.49, 58.66, 300.28°)
OKLab	oklab(31.81% 0.0022 -0.1466)
OKLCH	oklch(31.81% 0.147 270.9)
XYZ	xyz(4.6270, 2.8646, 19.0441)
Luminance	0.0286 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B237B #7B731B

analogous

#1B537B #1B237B #431B7B

triadic

#1B237B #7B1B23 #237B1B

tetradic

#1B237B #7B1B53 #7B731B #1B7B43

square

#1B237B #7B1B53 #7B731B #1B7B43

split-complementary

#1B237B #7B431B #537B1B

monochromatic

#060719 #101549 #1B237B #2631AD #3C49D4

Accessibility & contrast

On white

13.35

#1B237B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1B237B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B237B

13.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B237B	#FFFFFF	#000000	##FFFFFF
##1B237B	1.00	13.35	1.57	13.35
#FFFFFF	13.35	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347E

Deuteranopia (green-blind)

#002B79

Tritanopia (blue-blind)

#003B4C

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b237b;
/* rgb */ color: rgb(27, 35, 123);
/* oklch */ color: oklch(31.8% 0.147 270.9);

Tailwind

colors: {
  custom: {
    50: '#685ea2',
    500: '#1b237b',
    950: '#000000',
  },
}

SCSS

$custom: #1b237b;
$custom-light: #685ea2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b237b",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 123
  },
  "hsl": {
    "h": 235,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.31809,
    "c": 0.14661,
    "h": 270.9
  },
  "luminance": 0.02865
}

Semantic roles & 50–950 ramp

primary

#1B237B

secondary

#AFA643

accent

#D941E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B237B

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

Preview Lab → · Contrast checker → · Palette generator →