#1B307B#1B307B

#1B307B is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.3% C 0.130 H 267.1°. Best body text is #FFFFFF at 11.96:1 contrast (WCAG AA passes).

Color values

HEX	#1B307B
RGB	rgb(27, 48, 123)
HSL	hsl(227, 64%, 29%)
HSV	hsv(227, 78%, 48%)
CMYK	cmyk(78%, 61%, 0%, 51.8%)
CIE-LAB	lab(22.92, 20.63, -45.05)
CIE-LCH	lch(22.92, 49.54, 294.60°)
OKLab	oklab(34.33% -0.0065 -0.13)
OKLCH	oklch(34.33% 0.13 267.1)
XYZ	xyz(5.0829, 3.7764, 19.1961)
Luminance	0.0378 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B307B #7B661B

analogous

#1B607B #1B307B #361B7B

triadic

#1B307B #7B1B30 #307B1B

tetradic

#1B307B #7B1B60 #7B661B #1B7B36

square

#1B307B #7B1B60 #7B661B #1B7B36

split-complementary

#1B307B #7B361B #607B1B

monochromatic

#060A19 #101C49 #1B307B #2644AD #3C5DD4

Accessibility & contrast

On white

11.96

#1B307B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#1B307B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B307B

11.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B307B	#FFFFFF	#000000	##FFFFFF
##1B307B	1.00	11.96	1.76	11.96
#FFFFFF	11.96	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B7E

Deuteranopia (green-blind)

#00327A

Tritanopia (blue-blind)

#004350

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b307b;
/* rgb */ color: rgb(27, 48, 123);
/* oklch */ color: oklch(34.3% 0.130 267.1);

Tailwind

colors: {
  custom: {
    50: '#6767a2',
    500: '#1b307b',
    950: '#000000',
  },
}

SCSS

$custom: #1b307b;
$custom-light: #6767a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b307b",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 123
  },
  "hsl": {
    "h": 226.875,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.34328,
    "c": 0.13021,
    "h": 267.1
  },
  "luminance": 0.03777
}

Semantic roles & 50–950 ramp

primary

#1B307B

secondary

#AF9743

accent

#C341E7

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B307B

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

Preview Lab → · Contrast checker → · Palette generator →