#1B3D9B#1B3D9B

#1B3D9B is a dark, vivid blue. Relative luminance 0.059; OKLCH L 39.9% C 0.158 H 264.8°. Best body text is #FFFFFF at 9.60:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D9B
RGB	rgb(27, 61, 155)
HSL	hsl(224, 70%, 36%)
HSV	hsv(224, 83%, 61%)
CMYK	cmyk(82.6%, 60.6%, 0%, 39.2%)
CIE-LAB	lab(29.25, 24.40, -54.57)
CIE-LCH	lch(29.25, 59.78, 294.09°)
OKLab	oklab(39.91% -0.0144 -0.1578)
OKLCH	oklch(39.91% 0.158 264.8)
XYZ	xyz(8.0350, 5.9361, 31.7263)
Luminance	0.0594 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D9B #9B791B

analogous

#1B7D9B #1B3D9B #391B9B

triadic

#1B3D9B #9B1B3D #3D9B1B

tetradic

#1B3D9B #9B1B7D #9B791B #1B9B39

square

#1B3D9B #9B1B7D #9B791B #1B9B39

split-complementary

#1B3D9B #9B391B #7D9B1B

monochromatic

#091433 #122867 #1B3D9B #2452CF #5076E0

Accessibility & contrast

On white

9.60

#1B3D9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.19

#1B3D9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D9B

9.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D9B	#FFFFFF	#000000	##FFFFFF
##1B3D9B	1.00	9.60	2.19	9.60
#FFFFFF	9.60	1.00	21.00	1.00
#000000	2.19	21.00	1.00	21.00
##FFFFFF	9.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9E

Deuteranopia (green-blind)

#003F99

Tritanopia (blue-blind)

#005566

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #1b3d9b;
/* rgb */ color: rgb(27, 61, 155);
/* oklch */ color: oklch(39.9% 0.158 264.8);

Tailwind

colors: {
  custom: {
    50: '#6f72b9',
    500: '#1b3d9b',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d9b;
$custom-light: #6f72b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d9b",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 155
  },
  "hsl": {
    "h": 224.063,
    "s": 70.33,
    "l": 35.686
  },
  "oklch": {
    "l": 0.39913,
    "c": 0.15847,
    "h": 264.8
  },
  "luminance": 0.05937
}

Semantic roles & 50–950 ramp

primary

#1B3D9B

secondary

#C3A44F

accent

#BE3BED

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B3D9B

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

Preview Lab → · Contrast checker → · Palette generator →