#2540B1#2540B1

#2540B1 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.9% C 0.182 H 267.4°. Best body text is #FFFFFF at 8.58:1 contrast (WCAG AA passes).

Color values

HEX	#2540B1
RGB	rgb(37, 64, 177)
HSL	hsl(228, 65%, 42%)
HSV	hsv(228, 79%, 69%)
CMYK	cmyk(79.1%, 63.8%, 0%, 30.6%)
CIE-LAB	lab(32.33, 31.81, -62.75)
CIE-LCH	lch(32.33, 70.35, 296.88°)
OKLab	oklab(42.9% -0.0083 -0.1816)
OKLCH	oklch(42.9% 0.182 267.4)
XYZ	xyz(10.5294, 7.2332, 42.4277)
Luminance	0.0723 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2540B1 #B19625

analogous

#2586B1 #2540B1 #5025B1

triadic

#2540B1 #B12540 #40B125

tetradic

#2540B1 #B12586 #B19625 #25B150

square

#2540B1 #B12586 #B19625 #25B150

split-complementary

#2540B1 #B15025 #86B125

monochromatic

#101B4C #1A2E7E #2540B1 #3D5AD6 #6F85E1

Accessibility & contrast

On white

8.58

#2540B1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#2540B1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2540B1

8.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2540B1	#FFFFFF	#000000	##FFFFFF
##2540B1	1.00	8.58	2.45	8.58
#FFFFFF	8.58	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.58	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: #2540b1;
/* rgb */ color: rgb(37, 64, 177);
/* oklch */ color: oklch(42.9% 0.182 267.4);

Tailwind

colors: {
  custom: {
    50: '#7774c9',
    500: '#2540b1',
    950: '#000000',
  },
}

SCSS

$custom: #2540b1;
$custom-light: #7774c9;
$custom-dark: #000000;

JSON

{
  "hex": "#2540b1",
  "rgb": {
    "r": 37,
    "g": 64,
    "b": 177
  },
  "hsl": {
    "h": 228.429,
    "s": 65.421,
    "l": 41.961
  },
  "oklch": {
    "l": 0.42899,
    "c": 0.18175,
    "h": 267.4
  },
  "luminance": 0.07234
}

Semantic roles & 50–950 ramp

primary

#2540B1

secondary

#C8B66A

accent

#C83FE8

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2540B1

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

Preview Lab → · Contrast checker → · Palette generator →