#2539B0#2539B0

#2539B0 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.5% C 0.189 H 268.6°. Best body text is #FFFFFF at 9.17:1 contrast (WCAG AA passes).

Color values

HEX	#2539B0
RGB	rgb(37, 57, 176)
HSL	hsl(231, 65%, 42%)
HSV	hsv(231, 79%, 69%)
CMYK	cmyk(79%, 67.6%, 0%, 31%)
CIE-LAB	lab(30.53, 35.96, -65.11)
CIE-LCH	lch(30.53, 74.39, 298.91°)
OKLab	oklab(41.55% -0.0045 -0.1885)
OKLCH	oklch(41.55% 0.189 268.6)
XYZ	xyz(10.0598, 6.4530, 41.7812)
Luminance	0.0645 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2539B0 #B09C25

analogous

#257FB0 #2539B0 #5725B0

triadic

#2539B0 #B02539 #39B025

tetradic

#2539B0 #B0257F #B09C25 #25B057

square

#2539B0 #B0257F #B09C25 #25B057

split-complementary

#2539B0 #B05725 #7FB025

monochromatic

#10184B #1A297D #2539B0 #3C52D6 #6F7FE1

Accessibility & contrast

On white

9.17

#2539B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#2539B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2539B0

9.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2539B0	#FFFFFF	#000000	##FFFFFF
##2539B0	1.00	9.17	2.29	9.17
#FFFFFF	9.17	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FB4

Deuteranopia (green-blind)

#0041AE

Tritanopia (blue-blind)

#00596F

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #2539b0;
/* rgb */ color: rgb(37, 57, 176);
/* oklch */ color: oklch(41.5% 0.189 268.6);

Tailwind

colors: {
  custom: {
    50: '#776fc9',
    500: '#2539b0',
    950: '#000000',
  },
}

SCSS

$custom: #2539b0;
$custom-light: #776fc9;
$custom-dark: #000000;

JSON

{
  "hex": "#2539b0",
  "rgb": {
    "r": 37,
    "g": 57,
    "b": 176
  },
  "hsl": {
    "h": 231.367,
    "s": 65.258,
    "l": 41.765
  },
  "oklch": {
    "l": 0.41548,
    "c": 0.18858,
    "h": 268.6
  },
  "luminance": 0.06454
}

Semantic roles & 50–950 ramp

primary

#2539B0

secondary

#C7BA6A

accent

#D040E8

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #2539B0

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

Preview Lab → · Contrast checker → · Palette generator →