#1B3E8B#1B3E8B

#1B3E8B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.7% C 0.135 H 263.2°. Best body text is #FFFFFF at 9.96:1 contrast (WCAG AA passes).

Color values

HEX	#1B3E8B
RGB	rgb(27, 62, 139)
HSL	hsl(221, 67%, 33%)
HSV	hsv(221, 81%, 55%)
CMYK	cmyk(80.6%, 55.4%, 0%, 45.5%)
CIE-LAB	lab(28.22, 17.28, -46.43)
CIE-LCH	lch(28.22, 49.54, 290.41°)
OKLab	oklab(38.73% -0.0161 -0.1339)
OKLCH	oklch(38.73% 0.135 263.2)
XYZ	xyz(6.8332, 5.5415, 25.1306)
Luminance	0.0554 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3E8B #8B681B

analogous

#1B768B #1B3E8B #301B8B

triadic

#1B3E8B #8B1B3E #3E8B1B

tetradic

#1B3E8B #8B1B76 #8B681B #1B8B30

square

#1B3E8B #8B1B76 #8B681B #1B8B30

split-complementary

#1B3E8B #8B301B #768B1B

monochromatic

#071025 #112758 #1B3E8B #2555BE #4574DB

Accessibility & contrast

On white

9.96

#1B3E8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#1B3E8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3E8B

9.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3E8B	#FFFFFF	#000000	##FFFFFF
##1B3E8B	1.00	9.96	2.11	9.96
#FFFFFF	9.96	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00488E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b3e8b;
/* rgb */ color: rgb(27, 62, 139);
/* oklch */ color: oklch(38.7% 0.135 263.2);

Tailwind

colors: {
  custom: {
    50: '#6a72ad',
    500: '#1b3e8b',
    950: '#000000',
  },
}

SCSS

$custom: #1b3e8b;
$custom-light: #6a72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3e8b",
  "rgb": {
    "r": 27,
    "g": 62,
    "b": 139
  },
  "hsl": {
    "h": 221.25,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38732,
    "c": 0.13484,
    "h": 263.2
  },
  "luminance": 0.05542
}

Semantic roles & 50–950 ramp

primary

#1B3E8B

secondary

#BC9745

accent

#B43DEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1B3E8B

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

Preview Lab → · Contrast checker → · Palette generator →