#1B307E#1B307E

#1B307E is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.6% C 0.135 H 267.3°. Best body text is #FFFFFF at 11.86:1 contrast (WCAG AA passes).

Color values

HEX	#1B307E
RGB	rgb(27, 48, 126)
HSL	hsl(227, 65%, 30%)
HSV	hsv(227, 79%, 49%)
CMYK	cmyk(78.6%, 61.9%, 0%, 50.6%)
CIE-LAB	lab(23.18, 21.83, -46.52)
CIE-LCH	lch(23.18, 51.39, 295.14°)
OKLab	oklab(34.6% -0.0064 -0.1344)
OKLCH	oklch(34.6% 0.135 267.3)
XYZ	xyz(5.2735, 3.8527, 20.2003)
Luminance	0.0385 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B307E #7E691B

analogous

#1B617E #1B307E #381B7E

triadic

#1B307E #7E1B30 #307E1B

tetradic

#1B307E #7E1B61 #7E691B #1B7E38

square

#1B307E #7E1B61 #7E691B #1B7E38

split-complementary

#1B307E #7E381B #617E1B

monochromatic

#050A19 #101D4C #1B307E #2643B0 #3E5ED6

Accessibility & contrast

On white

11.86

#1B307E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1B307E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B307E

11.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B307E	#FFFFFF	#000000	##FFFFFF
##1B307E	1.00	11.86	1.77	11.86
#FFFFFF	11.86	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C81

Deuteranopia (green-blind)

#00337C

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b307e;
/* rgb */ color: rgb(27, 48, 126);
/* oklch */ color: oklch(34.6% 0.135 267.3);

Tailwind

colors: {
  custom: {
    50: '#6868a4',
    500: '#1b307e',
    950: '#000000',
  },
}

SCSS

$custom: #1b307e;
$custom-light: #6868a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b307e",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 126
  },
  "hsl": {
    "h": 227.273,
    "s": 64.706,
    "l": 30
  },
  "oklch": {
    "l": 0.34603,
    "c": 0.13453,
    "h": 267.3
  },
  "luminance": 0.03853
}

Semantic roles & 50–950 ramp

primary

#1B307E

secondary

#B29A43

accent

#C440E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B307E

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

Preview Lab → · Contrast checker → · Palette generator →