#273FAB#273FAB

#273FAB is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.2% C 0.174 H 268.1°. Best body text is #FFFFFF at 8.80:1 contrast (WCAG AA passes).

Color values

HEX	#273FAB
RGB	rgb(39, 63, 171)
HSL	hsl(229, 63%, 41%)
HSV	hsv(229, 77%, 67%)
CMYK	cmyk(77.2%, 63.2%, 0%, 32.9%)
CIE-LAB	lab(31.64, 30.42, -60.31)
CIE-LCH	lch(31.64, 67.54, 296.76°)
OKLab	oklab(42.25% -0.0058 -0.1744)
OKLCH	oklch(42.25% 0.174 268.1)
XYZ	xyz(9.9623, 6.9255, 39.3319)
Luminance	0.0693 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#273FAB #AB9327

analogous

#2781AB #273FAB #5127AB

triadic

#273FAB #AB273F #3FAB27

tetradic

#273FAB #AB2781 #AB9327 #27AB51

square

#273FAB #AB2781 #AB9327 #27AB51

split-complementary

#273FAB #AB5127 #81AB27

monochromatic

#101A47 #1C2D79 #273FAB #3D58D3 #6E83DE

Accessibility & contrast

On white

8.80

#273FAB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#273FAB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #273FAB

8.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##273FAB	#FFFFFF	#000000	##FFFFFF
##273FAB	1.00	8.80	2.39	8.80
#FFFFFF	8.80	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AE

Deuteranopia (green-blind)

#0044A9

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #273fab;
/* rgb */ color: rgb(39, 63, 171);
/* oklch */ color: oklch(42.2% 0.174 268.1);

Tailwind

colors: {
  custom: {
    50: '#7673c5',
    500: '#273fab',
    950: '#000000',
  },
}

SCSS

$custom: #273fab;
$custom-light: #7673c5;
$custom-dark: #000000;

JSON

{
  "hex": "#273fab",
  "rgb": {
    "r": 39,
    "g": 63,
    "b": 171
  },
  "hsl": {
    "h": 229.091,
    "s": 62.857,
    "l": 41.176
  },
  "oklch": {
    "l": 0.42247,
    "c": 0.17448,
    "h": 268.1
  },
  "luminance": 0.06927
}

Semantic roles & 50–950 ramp

primary

#273FAB

secondary

#C5B469

accent

#C842E6

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #273FAB

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

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