#1B3497#1B3497

#1B3497 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.8% C 0.164 H 266.8°. Best body text is #FFFFFF at 10.58:1 contrast (WCAG AA passes).

Color values

HEX	#1B3497
RGB	rgb(27, 52, 151)
HSL	hsl(228, 70%, 35%)
HSV	hsv(228, 82%, 59%)
CMYK	cmyk(82.1%, 65.6%, 0%, 40.8%)
CIE-LAB	lab(26.51, 28.94, -56.61)
CIE-LCH	lch(26.51, 63.58, 297.08°)
OKLab	oklab(37.77% -0.0092 -0.1639)
OKLCH	oklch(37.77% 0.164 266.8)
XYZ	xyz(7.2639, 4.9225, 29.8395)
Luminance	0.0492 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3497 #977E1B

analogous

#1B7297 #1B3497 #401B97

triadic

#1B3497 #971B34 #34971B

tetradic

#1B3497 #971B72 #977E1B #1B9740

square

#1B3497 #971B72 #977E1B #1B9740

split-complementary

#1B3497 #97401B #72971B

monochromatic

#08102F #122263 #1B3497 #2446CB #4D6BDF

Accessibility & contrast

On white

10.58

#1B3497 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1B3497 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3497

10.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3497	#FFFFFF	#000000	##FFFFFF
##1B3497	1.00	10.58	1.98	10.58
#FFFFFF	10.58	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00459A

Deuteranopia (green-blind)

#003995

Tritanopia (blue-blind)

#004E60

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3497;
/* rgb */ color: rgb(27, 52, 151);
/* oklch */ color: oklch(37.8% 0.164 266.8);

Tailwind

colors: {
  custom: {
    50: '#6e6bb7',
    500: '#1b3497',
    950: '#000000',
  },
}

SCSS

$custom: #1b3497;
$custom-light: #6e6bb7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3497",
  "rgb": {
    "r": 27,
    "g": 52,
    "b": 151
  },
  "hsl": {
    "h": 227.903,
    "s": 69.663,
    "l": 34.902
  },
  "oklch": {
    "l": 0.37772,
    "c": 0.16416,
    "h": 266.8
  },
  "luminance": 0.04923
}

Semantic roles & 50–950 ramp

primary

#1B3497

secondary

#C1AA4C

accent

#C93BEC

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090611

muted

#7B7A80

Preview Lab

Preview with #1B3497

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

Preview Lab → · Contrast checker → · Palette generator →