#1B308B#1B308B

#1B308B is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.8% C 0.153 H 267.5°. Best body text is #FFFFFF at 11.40:1 contrast (WCAG AA passes).

Color values

HEX	#1B308B
RGB	rgb(27, 48, 139)
HSL	hsl(229, 67%, 33%)
HSV	hsv(229, 81%, 55%)
CMYK	cmyk(80.6%, 65.5%, 0%, 45.5%)
CIE-LAB	lab(24.35, 26.98, -52.74)
CIE-LCH	lch(24.35, 59.24, 297.09°)
OKLab	oklab(35.84% -0.0065 -0.1526)
OKLCH	oklch(35.84% 0.153 267.5)
XYZ	xyz(6.1675, 4.2103, 24.9087)
Luminance	0.0421 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B308B #8B761B

analogous

#1B688B #1B308B #3E1B8B

triadic

#1B308B #8B1B30 #308B1B

tetradic

#1B308B #8B1B68 #8B761B #1B8B3E

square

#1B308B #8B1B68 #8B761B #1B8B3E

split-complementary

#1B308B #8B3E1B #688B1B

monochromatic

#070D25 #111E58 #1B308B #2542BE #4561DB

Accessibility & contrast

On white

11.40

#1B308B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1B308B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B308B

11.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B308B	#FFFFFF	#000000	##FFFFFF
##1B308B	1.00	11.40	1.84	11.40
#FFFFFF	11.40	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F8E

Deuteranopia (green-blind)

#003589

Tritanopia (blue-blind)

#004859

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b308b;
/* rgb */ color: rgb(27, 48, 139);
/* oklch */ color: oklch(35.8% 0.153 267.5);

Tailwind

colors: {
  custom: {
    50: '#6c68ae',
    500: '#1b308b',
    950: '#000000',
  },
}

SCSS

$custom: #1b308b;
$custom-light: #6c68ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b308b",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 139
  },
  "hsl": {
    "h": 228.75,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.35838,
    "c": 0.15276,
    "h": 267.5
  },
  "luminance": 0.04211
}

Semantic roles & 50–950 ramp

primary

#1B308B

secondary

#BCA645

accent

#CA3DEA

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1B308B

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

Preview Lab → · Contrast checker → · Palette generator →