#1B309F#1B309F

#1B309F is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.9% C 0.179 H 267.5°. Best body text is #FFFFFF at 10.66:1 contrast (WCAG AA passes).

Color values

HEX	#1B309F
RGB	rgb(27, 48, 159)
HSL	hsl(230, 71%, 36%)
HSV	hsv(230, 83%, 62%)
CMYK	cmyk(83%, 69.8%, 0%, 37.6%)
CIE-LAB	lab(26.30, 34.62, -61.84)
CIE-LCH	lch(26.30, 70.88, 299.24°)
OKLab	oklab(37.85% -0.0077 -0.1792)
OKLCH	oklch(37.85% 0.179 267.5)
XYZ	xyz(7.7648, 4.8492, 33.3209)
Luminance	0.0485 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B309F #9F8A1B

analogous

#1B729F #1B309F #481B9F

triadic

#1B309F #9F1B30 #309F1B

tetradic

#1B309F #9F1B72 #9F8A1B #1B9F48

square

#1B309F #9F1B72 #9F8A1B #1B9F48

split-complementary

#1B309F #9F481B #729F1B

monochromatic

#091036 #12206B #1B309F #2440D3 #5369E2

Accessibility & contrast

On white

10.66

#1B309F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B309F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B309F

10.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B309F	#FFFFFF	#000000	##FFFFFF
##1B309F	1.00	10.66	1.97	10.66
#FFFFFF	10.66	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0045A2

Deuteranopia (green-blind)

#00389D

Tritanopia (blue-blind)

#004F63

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b309f;
/* rgb */ color: rgb(27, 48, 159);
/* oklch */ color: oklch(37.9% 0.179 267.5);

Tailwind

colors: {
  custom: {
    50: '#7168bc',
    500: '#1b309f',
    950: '#000000',
  },
}

SCSS

$custom: #1b309f;
$custom-light: #7168bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b309f",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 159
  },
  "hsl": {
    "h": 230.455,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.37853,
    "c": 0.17936,
    "h": 267.5
  },
  "luminance": 0.0485
}

Semantic roles & 50–950 ramp

primary

#1B309F

secondary

#C5B251

accent

#D13AEE

background

#F7F6FB

surface

#EDEBF7

border

#C8C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1B309F

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

Preview Lab → · Contrast checker → · Palette generator →