#1B4F9F#1B4F9F

#1B4F9F is a dark, vivid blue. Relative luminance 0.083; OKLCH L 44.1% C 0.141 H 259.2°. Best body text is #FFFFFF at 7.88:1 contrast (WCAG AA passes).

Color values

HEX	#1B4F9F
RGB	rgb(27, 79, 159)
HSL	hsl(216, 71%, 36%)
HSV	hsv(216, 83%, 62%)
CMYK	cmyk(83%, 50.3%, 0%, 37.6%)
CIE-LAB	lab(34.65, 13.73, -48.22)
CIE-LCH	lch(34.65, 50.14, 285.90°)
OKLab	oklab(44.11% -0.0265 -0.1388)
OKLCH	oklch(44.11% 0.141 259.2)
XYZ	xyz(9.5037, 8.3270, 33.9006)
Luminance	0.0833 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4F9F #9F6B1B

analogous

#1B919F #1B4F9F #291B9F

triadic

#1B4F9F #9F1B4F #4F9F1B

tetradic

#1B4F9F #9F1B91 #9F6B1B #1B9F29

square

#1B4F9F #9F1B91 #9F6B1B #1B9F29

split-complementary

#1B4F9F #9F291B #919F1B

monochromatic

#091B36 #12356B #1B4F9F #2469D3 #538BE2

Accessibility & contrast

On white

7.88

#1B4F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.67

#1B4F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4F9F

7.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4F9F	#FFFFFF	#000000	##FFFFFF
##1B4F9F	1.00	7.88	2.67	7.88
#FFFFFF	7.88	1.00	21.00	1.00
#000000	2.67	21.00	1.00	21.00
##FFFFFF	7.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E58A2

Deuteranopia (green-blind)

#004C9D

Tritanopia (blue-blind)

#00626F

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #1b4f9f;
/* rgb */ color: rgb(27, 79, 159);
/* oklch */ color: oklch(44.1% 0.141 259.2);

Tailwind

colors: {
  custom: {
    50: '#6f7fbc',
    500: '#1b4f9f',
    950: '#000000',
  },
}

SCSS

$custom: #1b4f9f;
$custom-light: #6f7fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4f9f",
  "rgb": {
    "r": 27,
    "g": 79,
    "b": 159
  },
  "hsl": {
    "h": 216.364,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.44105,
    "c": 0.1413,
    "h": 259.2
  },
  "luminance": 0.08328
}

Semantic roles & 50–950 ramp

primary

#1B4F9F

secondary

#C59751

accent

#A73AEE

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1B4F9F

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

Preview Lab → · Contrast checker → · Palette generator →