#1B3F7F#1B3F7F

#1B3F7F is a dark, moderate blue. Relative luminance 0.053; OKLCH L 38.0% C 0.116 H 260.9°. Best body text is #FFFFFF at 10.17:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F7F
RGB	rgb(27, 63, 127)
HSL	hsl(218, 65%, 30%)
HSV	hsv(218, 79%, 50%)
CMYK	cmyk(78.7%, 50.4%, 0%, 50.2%)
CIE-LAB	lab(27.63, 11.69, -39.93)
CIE-LCH	lch(27.63, 41.61, 286.32°)
OKLab	oklab(37.99% -0.0184 -0.1147)
OKLCH	oklch(37.99% 0.116 260.9)
XYZ	xyz(6.0589, 5.3196, 20.7820)
Luminance	0.0532 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F7F #7F5B1B

analogous

#1B717F #1B3F7F #291B7F

triadic

#1B3F7F #7F1B3F #3F7F1B

tetradic

#1B3F7F #7F1B71 #7F5B1B #1B7F29

square

#1B3F7F #7F1B71 #7F5B1B #1B7F29

split-complementary

#1B3F7F #7F291B #717F1B

monochromatic

#060D1A #10264D #1B3F7F #2658B1 #3E75D6

Accessibility & contrast

On white

10.17

#1B3F7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#1B3F7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F7F

10.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F7F	#FFFFFF	#000000	##FFFFFF
##1B3F7F	1.00	10.17	2.06	10.17
#FFFFFF	10.17	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4681

Deuteranopia (green-blind)

#003D7E

Tritanopia (blue-blind)

#004E59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3f7f;
/* rgb */ color: rgb(27, 63, 127);
/* oklch */ color: oklch(38.0% 0.116 260.9);

Tailwind

colors: {
  custom: {
    50: '#6773a5',
    500: '#1b3f7f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f7f;
$custom-light: #6773a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f7f",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 127
  },
  "hsl": {
    "h": 218.4,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.37992,
    "c": 0.11621,
    "h": 260.9
  },
  "luminance": 0.0532
}

Semantic roles & 50–950 ramp

primary

#1B3F7F

secondary

#B38B43

accent

#AB40E8

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B3F7F

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

Preview Lab → · Contrast checker → · Palette generator →