#1B3A7F#1B3A7F

#1B3A7F is a dark, vivid blue. Relative luminance 0.048; OKLCH L 36.9% C 0.123 H 263.4°. Best body text is #FFFFFF at 10.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A7F
RGB	rgb(27, 58, 127)
HSL	hsl(221, 65%, 30%)
HSV	hsv(221, 79%, 50%)
CMYK	cmyk(78.7%, 54.3%, 0%, 50.2%)
CIE-LAB	lab(26.13, 15.19, -42.35)
CIE-LCH	lch(26.13, 44.99, 289.73°)
OKLab	oklab(36.85% -0.0141 -0.1219)
OKLCH	oklch(36.85% 0.123 263.4)
XYZ	xyz(5.7944, 4.7908, 20.6939)
Luminance	0.0479 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A7F #7F601B

analogous

#1B6C7F #1B3A7F #2E1B7F

triadic

#1B3A7F #7F1B3A #3A7F1B

tetradic

#1B3A7F #7F1B6C #7F601B #1B7F2E

square

#1B3A7F #7F1B6C #7F601B #1B7F2E

split-complementary

#1B3A7F #7F2E1B #6C7F1B

monochromatic

#060C1A #10234D #1B3A7F #2651B1 #3E6DD6

Accessibility & contrast

On white

10.72

#1B3A7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1B3A7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A7F

10.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A7F	#FFFFFF	#000000	##FFFFFF
##1B3A7F	1.00	10.72	1.96	10.72
#FFFFFF	10.72	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#094381

Deuteranopia (green-blind)

#00397E

Tritanopia (blue-blind)

#004B56

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3a7f;
/* rgb */ color: rgb(27, 58, 127);
/* oklch */ color: oklch(36.9% 0.123 263.4);

Tailwind

colors: {
  custom: {
    50: '#686fa5',
    500: '#1b3a7f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a7f;
$custom-light: #686fa5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a7f",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 127
  },
  "hsl": {
    "h": 221.4,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.3685,
    "c": 0.12277,
    "h": 263.4
  },
  "luminance": 0.04791
}

Semantic roles & 50–950 ramp

primary

#1B3A7F

secondary

#B39043

accent

#B440E8

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3A7F

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

Preview Lab → · Contrast checker → · Palette generator →