#1B308F#1B308F

#1B308F is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.2% C 0.158 H 267.6°. Best body text is #FFFFFF at 11.25:1 contrast (WCAG AA passes).

Color values

HEX	#1B308F
RGB	rgb(27, 48, 143)
HSL	hsl(229, 68%, 33%)
HSV	hsv(229, 81%, 56%)
CMYK	cmyk(81.1%, 66.4%, 0%, 43.9%)
CIE-LAB	lab(24.73, 28.54, -54.61)
CIE-LCH	lch(24.73, 61.61, 297.59°)
OKLab	oklab(36.23% -0.0067 -0.1581)
OKLCH	oklch(36.23% 0.158 267.6)
XYZ	xyz(6.4651, 4.3293, 26.4762)
Luminance	0.0433 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B308F #8F7A1B

analogous

#1B6A8F #1B308F #401B8F

triadic

#1B308F #8F1B30 #308F1B

tetradic

#1B308F #8F1B6A #8F7A1B #1B8F40

square

#1B308F #8F1B6A #8F7A1B #1B8F40

split-complementary

#1B308F #8F401B #6A8F1B

monochromatic

#080D28 #111F5C #1B308F #2541C2 #4863DC

Accessibility & contrast

On white

11.25

#1B308F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#1B308F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B308F

11.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B308F	#FFFFFF	#000000	##FFFFFF
##1B308F	1.00	11.25	1.87	11.25
#FFFFFF	11.25	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004092

Deuteranopia (green-blind)

#00358D

Tritanopia (blue-blind)

#00495B

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b308f;
/* rgb */ color: rgb(27, 48, 143);
/* oklch */ color: oklch(36.2% 0.158 267.6);

Tailwind

colors: {
  custom: {
    50: '#6d68b1',
    500: '#1b308f',
    950: '#000000',
  },
}

SCSS

$custom: #1b308f;
$custom-light: #6d68b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b308f",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 143
  },
  "hsl": {
    "h": 229.138,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.36231,
    "c": 0.15821,
    "h": 267.6
  },
  "luminance": 0.0433
}

Semantic roles & 50–950 ramp

primary

#1B308F

secondary

#BEA948

accent

#CC3DEB

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080611

muted

#7B7A80

Preview Lab

Preview with #1B308F

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

Preview Lab → · Contrast checker → · Palette generator →