#1B307F#1B307F

#1B307F is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.7% C 0.136 H 267.3°. Best body text is #FFFFFF at 11.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B307F
RGB	rgb(27, 48, 127)
HSL	hsl(227, 65%, 30%)
HSV	hsv(227, 79%, 50%)
CMYK	cmyk(78.7%, 62.2%, 0%, 50.2%)
CIE-LAB	lab(23.27, 22.23, -47.01)
CIE-LCH	lch(23.27, 52.00, 295.31°)
OKLab	oklab(34.7% -0.0064 -0.1358)
OKLCH	oklch(34.7% 0.136 267.3)
XYZ	xyz(5.3384, 3.8786, 20.5419)
Luminance	0.0388 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B307F #7F6A1B

analogous

#1B627F #1B307F #381B7F

triadic

#1B307F #7F1B30 #307F1B

tetradic

#1B307F #7F1B62 #7F6A1B #1B7F38

square

#1B307F #7F1B62 #7F6A1B #1B7F38

split-complementary

#1B307F #7F381B #627F1B

monochromatic

#060A1A #101D4D #1B307F #2643B1 #3E5ED6

Accessibility & contrast

On white

11.83

#1B307F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1B307F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B307F

11.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B307F	#FFFFFF	#000000	##FFFFFF
##1B307F	1.00	11.83	1.78	11.83
#FFFFFF	11.83	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C82

Deuteranopia (green-blind)

#00337D

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b307f;
/* rgb */ color: rgb(27, 48, 127);
/* oklch */ color: oklch(34.7% 0.136 267.3);

Tailwind

colors: {
  custom: {
    50: '#6868a5',
    500: '#1b307f',
    950: '#000000',
  },
}

SCSS

$custom: #1b307f;
$custom-light: #6868a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b307f",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 127
  },
  "hsl": {
    "h": 227.4,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.34696,
    "c": 0.13596,
    "h": 267.3
  },
  "luminance": 0.03879
}

Semantic roles & 50–950 ramp

primary

#1B307F

secondary

#B39B43

accent

#C540E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B307F

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

Preview Lab → · Contrast checker → · Palette generator →