#1B3A88#1B3A88

#1B3A88 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.6% C 0.136 H 264.4°. Best body text is #FFFFFF at 10.46:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A88
RGB	rgb(27, 58, 136)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 53%)
CMYK	cmyk(80.1%, 57.4%, 0%, 46.7%)
CIE-LAB	lab(26.84, 18.85, -46.83)
CIE-LCH	lch(26.84, 50.48, 291.93°)
OKLab	oklab(37.61% -0.0133 -0.1351)
OKLCH	oklch(37.61% 0.136 264.4)
XYZ	xyz(6.4074, 5.0360, 23.9221)
Luminance	0.0504 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A88 #88691B

analogous

#1B7188 #1B3A88 #331B88

triadic

#1B3A88 #881B3A #3A881B

tetradic

#1B3A88 #881B71 #88691B #1B8833

square

#1B3A88 #881B71 #88691B #1B8833

split-complementary

#1B3A88 #88331B #71881B

monochromatic

#070E22 #112455 #1B3A88 #2550BB #446EDA

Accessibility & contrast

On white

10.46

#1B3A88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1B3A88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A88

10.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A88	#FFFFFF	#000000	##FFFFFF
##1B3A88	1.00	10.46	2.01	10.46
#FFFFFF	10.46	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458B

Deuteranopia (green-blind)

#003B86

Tritanopia (blue-blind)

#004D5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3a88;
/* rgb */ color: rgb(27, 58, 136);
/* oklch */ color: oklch(37.6% 0.136 264.4);

Tailwind

colors: {
  custom: {
    50: '#6a6fab',
    500: '#1b3a88',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a88;
$custom-light: #6a6fab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a88",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 136
  },
  "hsl": {
    "h": 222.936,
    "s": 66.871,
    "l": 31.961
  },
  "oklch": {
    "l": 0.37608,
    "c": 0.13576,
    "h": 264.4
  },
  "luminance": 0.05037
}

Semantic roles & 50–950 ramp

primary

#1B3A88

secondary

#BB9944

accent

#B93EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3A88

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

Preview Lab → · Contrast checker → · Palette generator →