#2528B3#2528B3

#2528B3 is a dark, highly saturated blue. Relative luminance 0.052; OKLCH L 39.3% C 0.210 H 270.6°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#2528B3
RGB	rgb(37, 40, 179)
HSL	hsl(239, 66%, 42%)
HSV	hsv(239, 79%, 70%)
CMYK	cmyk(79.3%, 77.7%, 0%, 29.8%)
CIE-LAB	lab(27.20, 47.10, -72.40)
CIE-LCH	lch(27.20, 86.37, 303.05°)
OKLab	oklab(39.25% 0.0022 -0.2097)
OKLCH	oklch(39.25% 0.21 270.6)
XYZ	xyz(9.6557, 5.1645, 43.1270)
Luminance	0.0517 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2528B3 #B3B025

analogous

#256FB3 #2528B3 #6925B3

triadic

#2528B3 #B32528 #28B325

tetradic

#2528B3 #B3256F #B3B025 #25B369

square

#2528B3 #B3256F #B3B025 #25B369

split-complementary

#2528B3 #B36925 #6FB325

monochromatic

#10114E #1B1D80 #2528B3 #3E41D7 #7173E2

Accessibility & contrast

On white

10.33

#2528B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#2528B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2528B3

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2528B3	#FFFFFF	#000000	##FFFFFF
##2528B3	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047B7

Deuteranopia (green-blind)

#0039B1

Tritanopia (blue-blind)

#00526D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #2528b3;
/* rgb */ color: rgb(37, 40, 179);
/* oklch */ color: oklch(39.3% 0.210 270.6);

Tailwind

colors: {
  custom: {
    50: '#7a64cb',
    500: '#2528b3',
    950: '#000000',
  },
}

SCSS

$custom: #2528b3;
$custom-light: #7a64cb;
$custom-dark: #000000;

JSON

{
  "hex": "#2528b3",
  "rgb": {
    "r": 37,
    "g": 40,
    "b": 179
  },
  "hsl": {
    "h": 238.732,
    "s": 65.741,
    "l": 42.353
  },
  "oklch": {
    "l": 0.39254,
    "c": 0.20967,
    "h": 270.6
  },
  "luminance": 0.05166
}

Semantic roles & 50–950 ramp

primary

#2528B3

secondary

#C8C66B

accent

#E53FE9

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0B0613

muted

#7C7A82

Preview Lab

Preview with #2528B3

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

Preview Lab → · Contrast checker → · Palette generator →