#1B4288#1B4288

#1B4288 is a dark, vivid blue. Relative luminance 0.059; OKLCH L 39.4% C 0.125 H 261.0°. Best body text is #FFFFFF at 9.63:1 contrast (WCAG AA passes).

Color values

HEX	#1B4288
RGB	rgb(27, 66, 136)
HSL	hsl(219, 67%, 32%)
HSV	hsv(219, 80%, 53%)
CMYK	cmyk(80.1%, 51.5%, 0%, 46.7%)
CIE-LAB	lab(29.17, 13.28, -43.04)
CIE-LCH	lch(29.17, 45.04, 287.15°)
OKLab	oklab(39.38% -0.0196 -0.1238)
OKLCH	oklch(39.38% 0.125 261)
XYZ	xyz(6.8425, 5.9062, 24.0672)
Luminance	0.0591 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4288 #88611B

analogous

#1B7988 #1B4288 #2B1B88

triadic

#1B4288 #881B42 #42881B

tetradic

#1B4288 #881B79 #88611B #1B882B

square

#1B4288 #881B79 #88611B #1B882B

split-complementary

#1B4288 #882B1B #79881B

monochromatic

#071022 #112955 #1B4288 #255BBB #4479DA

Accessibility & contrast

On white

9.63

#1B4288 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.18

#1B4288 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4288

9.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4288	#FFFFFF	#000000	##FFFFFF
##1B4288	1.00	9.63	2.18	9.63
#FFFFFF	9.63	1.00	21.00	1.00
#000000	2.18	21.00	1.00	21.00
##FFFFFF	9.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#174A8B

Deuteranopia (green-blind)

#004087

Tritanopia (blue-blind)

#00535E

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #1b4288;
/* rgb */ color: rgb(27, 66, 136);
/* oklch */ color: oklch(39.4% 0.125 261.0);

Tailwind

colors: {
  custom: {
    50: '#6975ab',
    500: '#1b4288',
    950: '#000000',
  },
}

SCSS

$custom: #1b4288;
$custom-light: #6975ab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4288",
  "rgb": {
    "r": 27,
    "g": 66,
    "b": 136
  },
  "hsl": {
    "h": 218.532,
    "s": 66.871,
    "l": 31.961
  },
  "oklch": {
    "l": 0.39384,
    "c": 0.12536,
    "h": 261
  },
  "luminance": 0.05907
}

Semantic roles & 50–950 ramp

primary

#1B4288

secondary

#BB9044

accent

#AC3EEA

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #1B4288

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

Preview Lab → · Contrast checker → · Palette generator →