Ultramarine Blue#1805DB

#1805DB is a dark, highly saturated blue. Relative luminance 0.054; OKLCH L 41.0% C 0.274 H 266.8°. Best body text is #FFFFFF at 10.08:1 contrast (WCAG AA passes).

Ultramarine Blue — editorial page

Color values

HEX	#1805DB
RGB	rgb(24, 5, 219)
HSL	hsl(245, 96%, 44%)
HSV	hsv(245, 98%, 86%)
CMYK	cmyk(89%, 97.7%, 0%, 14.1%)
CIE-LAB	lab(27.89, 69.84, -94.74)
CIE-LCH	lch(27.89, 117.70, 306.40°)
OKLab	oklab(41.01% -0.0154 -0.2737)
OKLCH	oklch(41.01% 0.274 266.8)
XYZ	xyz(13.2128, 5.4155, 67.3530)
Luminance	0.0542 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1805DB #C8DB05

analogous

#055DDB #1805DB #8305DB

triadic

#1805DB #DB1805 #05DB18

tetradic

#1805DB #DB055D #C8DB05 #05DB83

square

#1805DB #DB055D #C8DB05 #05DB83

split-complementary

#1805DB #DB8305 #5DDB05

monochromatic

#0B0263 #11049F #1805DB #3623FA #6D5FFB

Accessibility & contrast

On white

10.08

#1805DB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#1805DB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1805DB

10.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1805DB	#FFFFFF	#000000	##FFFFFF
##1805DB	1.00	10.08	2.08	10.08
#FFFFFF	10.08	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CE0

Deuteranopia (green-blind)

#0036D8

Tritanopia (blue-blind)

#005B80

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1805db;
/* rgb */ color: rgb(24, 5, 219);
/* oklch */ color: oklch(41.0% 0.274 266.8);

Tailwind

colors: {
  custom: {
    50: '#835ae8',
    500: '#1805db',
    950: '#000000',
  },
}

SCSS

$custom: #1805db;
$custom-light: #835ae8;
$custom-dark: #000000;

JSON

{
  "hex": "#1805db",
  "rgb": {
    "r": 24,
    "g": 5,
    "b": 219
  },
  "hsl": {
    "h": 245.327,
    "s": 95.536,
    "l": 43.922
  },
  "oklch": {
    "l": 0.41006,
    "c": 0.27411,
    "h": 266.8
  },
  "luminance": 0.05417
}

Semantic roles & 50–950 ramp

primary

#1805DB

secondary

#D3DF5D

accent

#FF29EC

background

#F9F5FE

surface

#F2E9FD

border

#CCC5D5

text

#0E0516

muted

#7E7984

Preview Lab

Preview with #1805DB

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

Preview Lab → · Contrast checker → · Palette generator →