#2740B1#2740B1

#2740B1 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.0% C 0.181 H 267.9°. Best body text is #FFFFFF at 8.56:1 contrast (WCAG AA passes).

Color values

HEX	#2740B1
RGB	rgb(39, 64, 177)
HSL	hsl(229, 64%, 42%)
HSV	hsv(229, 78%, 69%)
CMYK	cmyk(78%, 63.8%, 0%, 30.6%)
CIE-LAB	lab(32.42, 32.00, -62.61)
CIE-LCH	lch(32.42, 70.31, 297.08°)
OKLab	oklab(42.99% -0.0066 -0.1811)
OKLCH	oklch(42.99% 0.181 267.9)
XYZ	xyz(10.6032, 7.2713, 42.4311)
Luminance	0.0727 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2740B1 #B19827

analogous

#2785B1 #2740B1 #5327B1

triadic

#2740B1 #B12740 #40B127

tetradic

#2740B1 #B12785 #B19827 #27B153

square

#2740B1 #B12785 #B19827 #27B153

split-complementary

#2740B1 #B15327 #85B127

monochromatic

#111C4D #1C2E7F #2740B1 #405BD5 #7286E0

Accessibility & contrast

On white

8.56

#2740B1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#2740B1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2740B1

8.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2740B1	#FFFFFF	#000000	##FFFFFF
##2740B1	1.00	8.56	2.45	8.56
#FFFFFF	8.56	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B5

Deuteranopia (green-blind)

#0046AF

Tritanopia (blue-blind)

#005E72

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #2740b1;
/* rgb */ color: rgb(39, 64, 177);
/* oklch */ color: oklch(43.0% 0.181 267.9);

Tailwind

colors: {
  custom: {
    50: '#7874c9',
    500: '#2740b1',
    950: '#000000',
  },
}

SCSS

$custom: #2740b1;
$custom-light: #7874c9;
$custom-dark: #000000;

JSON

{
  "hex": "#2740b1",
  "rgb": {
    "r": 39,
    "g": 64,
    "b": 177
  },
  "hsl": {
    "h": 229.13,
    "s": 63.889,
    "l": 42.353
  },
  "oklch": {
    "l": 0.42985,
    "c": 0.18123,
    "h": 267.9
  },
  "luminance": 0.07272
}

Semantic roles & 50–950 ramp

primary

#2740B1

secondary

#C7B76D

accent

#C941E7

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2740B1

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

Preview Lab → · Contrast checker → · Palette generator →