#1B307C#1B307C

#1B307C is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.4% C 0.132 H 267.2°. Best body text is #FFFFFF at 11.93:1 contrast (WCAG AA passes).

Color values

HEX	#1B307C
RGB	rgb(27, 48, 124)
HSL	hsl(227, 64%, 30%)
HSV	hsv(227, 78%, 49%)
CMYK	cmyk(78.2%, 61.3%, 0%, 51.4%)
CIE-LAB	lab(23.00, 21.03, -45.54)
CIE-LCH	lch(23.00, 50.16, 294.79°)
OKLab	oklab(34.42% -0.0065 -0.1315)
OKLCH	oklch(34.42% 0.132 267.2)
XYZ	xyz(5.1458, 3.8016, 19.5275)
Luminance	0.0380 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B307C #7C671B

analogous

#1B617C #1B307C #361B7C

triadic

#1B307C #7C1B30 #307C1B

tetradic

#1B307C #7C1B61 #7C671B #1B7C36

square

#1B307C #7C1B61 #7C671B #1B7C36

split-complementary

#1B307C #7C361B #617C1B

monochromatic

#050A19 #101D4A #1B307C #2643AE #3D5ED5

Accessibility & contrast

On white

11.93

#1B307C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#1B307C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B307C

11.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B307C	#FFFFFF	#000000	##FFFFFF
##1B307C	1.00	11.93	1.76	11.93
#FFFFFF	11.93	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C7F

Deuteranopia (green-blind)

#00337B

Tritanopia (blue-blind)

#004351

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b307c;
/* rgb */ color: rgb(27, 48, 124);
/* oklch */ color: oklch(34.4% 0.132 267.2);

Tailwind

colors: {
  custom: {
    50: '#6868a3',
    500: '#1b307c',
    950: '#000000',
  },
}

SCSS

$custom: #1b307c;
$custom-light: #6868a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b307c",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 124
  },
  "hsl": {
    "h": 227.01,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.34419,
    "c": 0.13166,
    "h": 267.2
  },
  "luminance": 0.03802
}

Semantic roles & 50–950 ramp

primary

#1B307C

secondary

#B09843

accent

#C341E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B307C

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

Preview Lab → · Contrast checker → · Palette generator →