#1B3F88#1B3F88

#1B3F88 is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.7% C 0.129 H 262.4°. Best body text is #FFFFFF at 9.94:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F88
RGB	rgb(27, 63, 136)
HSL	hsl(220, 67%, 32%)
HSV	hsv(220, 80%, 53%)
CMYK	cmyk(80.1%, 53.7%, 0%, 46.7%)
CIE-LAB	lab(28.29, 15.36, -44.47)
CIE-LCH	lch(28.29, 47.05, 289.06°)
OKLab	oklab(38.71% -0.0172 -0.1281)
OKLCH	oklch(38.71% 0.129 262.4)
XYZ	xyz(6.6718, 5.5648, 24.0103)
Luminance	0.0557 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F88 #88641B

analogous

#1B7688 #1B3F88 #2D1B88

triadic

#1B3F88 #881B3F #3F881B

tetradic

#1B3F88 #881B76 #88641B #1B882D

square

#1B3F88 #881B76 #88641B #1B882D

split-complementary

#1B3F88 #882D1B #76881B

monochromatic

#071022 #112755 #1B3F88 #2557BB #4475DA

Accessibility & contrast

On white

9.94

#1B3F88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#1B3F88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F88

9.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F88	#FFFFFF	#000000	##FFFFFF
##1B3F88	1.00	9.94	2.11	9.94
#FFFFFF	9.94	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C488B

Deuteranopia (green-blind)

#003E87

Tritanopia (blue-blind)

#00515D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b3f88;
/* rgb */ color: rgb(27, 63, 136);
/* oklch */ color: oklch(38.7% 0.129 262.4);

Tailwind

colors: {
  custom: {
    50: '#6a73ab',
    500: '#1b3f88',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f88;
$custom-light: #6a73ab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f88",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 136
  },
  "hsl": {
    "h": 220.183,
    "s": 66.871,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38707,
    "c": 0.12925,
    "h": 262.4
  },
  "luminance": 0.05566
}

Semantic roles & 50–950 ramp

primary

#1B3F88

secondary

#BB9444

accent

#B13EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #1B3F88

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

Preview Lab → · Contrast checker → · Palette generator →