#1B3D9F#1B3D9F

#1B3D9F is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.3% C 0.164 H 265.0°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D9F
RGB	rgb(27, 61, 159)
HSL	hsl(225, 71%, 36%)
HSV	hsv(225, 83%, 62%)
CMYK	cmyk(83%, 61.6%, 0%, 37.6%)
CIE-LAB	lab(29.60, 25.98, -56.44)
CIE-LCH	lch(29.60, 62.13, 294.71°)
OKLab	oklab(40.28% -0.0143 -0.1633)
OKLCH	oklch(40.28% 0.164 265)
XYZ	xyz(8.3765, 6.0727, 33.5248)
Luminance	0.0607 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D9F #9F7D1B

analogous

#1B7F9F #1B3D9F #3B1B9F

triadic

#1B3D9F #9F1B3D #3D9F1B

tetradic

#1B3D9F #9F1B7F #9F7D1B #1B9F3B

square

#1B3D9F #9F1B7F #9F7D1B #1B9F3B

split-complementary

#1B3D9F #9F3B1B #7F9F1B

monochromatic

#091536 #12296B #1B3D9F #2451D3 #5378E2

Accessibility & contrast

On white

9.48

#1B3D9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#1B3D9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D9F

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D9F	#FFFFFF	#000000	##FFFFFF
##1B3D9F	1.00	9.48	2.21	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA2

Deuteranopia (green-blind)

#00409D

Tritanopia (blue-blind)

#005668

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b3d9f;
/* rgb */ color: rgb(27, 61, 159);
/* oklch */ color: oklch(40.3% 0.164 265.0);

Tailwind

colors: {
  custom: {
    50: '#7072bc',
    500: '#1b3d9f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d9f;
$custom-light: #7072bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d9f",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 159
  },
  "hsl": {
    "h": 224.545,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.40277,
    "c": 0.16392,
    "h": 265
  },
  "luminance": 0.06074
}

Semantic roles & 50–950 ramp

primary

#1B3D9F

secondary

#C5A751

accent

#BF3AEE

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B3D9F

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

Preview Lab → · Contrast checker → · Palette generator →