#1B377F#1B377F

#1B377F is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.2% C 0.127 H 264.7°. Best body text is #FFFFFF at 11.05:1 contrast (WCAG AA passes).

Color values

HEX	#1B377F
RGB	rgb(27, 55, 127)
HSL	hsl(223, 65%, 30%)
HSV	hsv(223, 79%, 50%)
CMYK	cmyk(78.7%, 56.7%, 0%, 50.2%)
CIE-LAB	lab(25.25, 17.30, -43.78)
CIE-LCH	lch(25.25, 47.07, 291.57°)
OKLab	oklab(36.18% -0.0117 -0.1262)
OKLCH	oklch(36.18% 0.127 264.7)
XYZ	xyz(5.6476, 4.4971, 20.6449)
Luminance	0.0450 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B377F #7F631B

analogous

#1B697F #1B377F #311B7F

triadic

#1B377F #7F1B37 #377F1B

tetradic

#1B377F #7F1B69 #7F631B #1B7F31

square

#1B377F #7F1B69 #7F631B #1B7F31

split-complementary

#1B377F #7F311B #697F1B

monochromatic

#060B1A #10214D #1B377F #264DB1 #3E69D6

Accessibility & contrast

On white

11.05

#1B377F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#1B377F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B377F

11.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B377F	#FFFFFF	#000000	##FFFFFF
##1B377F	1.00	11.05	1.90	11.05
#FFFFFF	11.05	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004182

Deuteranopia (green-blind)

#00377E

Tritanopia (blue-blind)

#004955

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b377f;
/* rgb */ color: rgb(27, 55, 127);
/* oklch */ color: oklch(36.2% 0.127 264.7);

Tailwind

colors: {
  custom: {
    50: '#686da5',
    500: '#1b377f',
    950: '#000000',
  },
}

SCSS

$custom: #1b377f;
$custom-light: #686da5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b377f",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 127
  },
  "hsl": {
    "h": 223.2,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.36184,
    "c": 0.12674,
    "h": 264.7
  },
  "luminance": 0.04498
}

Semantic roles & 50–950 ramp

primary

#1B377F

secondary

#B39343

accent

#B940E8

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B377F

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

Preview Lab → · Contrast checker → · Palette generator →