#2540B0#2540B0

#2540B0 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.8% C 0.180 H 267.4°. Best body text is #FFFFFF at 8.61:1 contrast (WCAG AA passes).

Color values

HEX	#2540B0
RGB	rgb(37, 64, 176)
HSL	hsl(228, 65%, 42%)
HSV	hsv(228, 79%, 69%)
CMYK	cmyk(79%, 63.6%, 0%, 31%)
CIE-LAB	lab(32.24, 31.43, -62.30)
CIE-LCH	lch(32.24, 69.78, 296.77°)
OKLab	oklab(42.81% -0.0083 -0.1802)
OKLCH	oklch(42.81% 0.18 267.4)
XYZ	xyz(10.4301, 7.1935, 41.9047)
Luminance	0.0720 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2540B0 #B09525

analogous

#2586B0 #2540B0 #4F25B0

triadic

#2540B0 #B02540 #40B025

tetradic

#2540B0 #B02586 #B09525 #25B04F

square

#2540B0 #B02586 #B09525 #25B04F

split-complementary

#2540B0 #B04F25 #86B025

monochromatic

#101B4B #1A2E7D #2540B0 #3C5AD6 #6F85E1

Accessibility & contrast

On white

8.61

#2540B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#2540B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2540B0

8.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2540B0	#FFFFFF	#000000	##FFFFFF
##2540B0	1.00	8.61	2.44	8.61
#FFFFFF	8.61	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B4

Deuteranopia (green-blind)

#0045AE

Tritanopia (blue-blind)

#005D72

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #2540b0;
/* rgb */ color: rgb(37, 64, 176);
/* oklch */ color: oklch(42.8% 0.180 267.4);

Tailwind

colors: {
  custom: {
    50: '#7774c9',
    500: '#2540b0',
    950: '#000000',
  },
}

SCSS

$custom: #2540b0;
$custom-light: #7774c9;
$custom-dark: #000000;

JSON

{
  "hex": "#2540b0",
  "rgb": {
    "r": 37,
    "g": 64,
    "b": 176
  },
  "hsl": {
    "h": 228.345,
    "s": 65.258,
    "l": 41.765
  },
  "oklch": {
    "l": 0.42807,
    "c": 0.18044,
    "h": 267.4
  },
  "luminance": 0.07195
}

Semantic roles & 50–950 ramp

primary

#2540B0

secondary

#C7B56A

accent

#C740E8

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2540B0

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

Preview Lab → · Contrast checker → · Palette generator →