#2559B4#2559B4

#2559B4 is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.2% C 0.155 H 260.7°. Best body text is #FFFFFF at 6.63:1 contrast (WCAG AA passes).

Color values

HEX	#2559B4
RGB	rgb(37, 89, 180)
HSL	hsl(218, 66%, 43%)
HSV	hsv(218, 79%, 71%)
CMYK	cmyk(79.4%, 50.6%, 0%, 29.4%)
CIE-LAB	lab(39.30, 16.40, -53.19)
CIE-LCH	lch(39.30, 55.67, 287.14°)
OKLab	oklab(48.21% -0.025 -0.1531)
OKLCH	oklch(48.21% 0.155 260.7)
XYZ	xyz(12.5706, 10.8319, 44.5994)
Luminance	0.1083 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2559B4 #B48025

analogous

#25A0B4 #2559B4 #3925B4

triadic

#2559B4 #B42559 #59B425

tetradic

#2559B4 #B425A0 #B48025 #25B439

square

#2559B4 #B425A0 #B48025 #25B439

split-complementary

#2559B4 #B43925 #A0B425

monochromatic

#10274E #1B4081 #2559B4 #3F76D7 #719AE2

Accessibility & contrast

On white

6.63

#2559B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.17

#2559B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2559B4

6.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2559B4	#FFFFFF	#000000	##FFFFFF
##2559B4	1.00	6.63	3.17	6.63
#FFFFFF	6.63	1.00	21.00	1.00
#000000	3.17	21.00	1.00	21.00
##FFFFFF	6.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2063B7

Deuteranopia (green-blind)

#0056B2

Tritanopia (blue-blind)

#006F7E

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #2559b4;
/* rgb */ color: rgb(37, 89, 180);
/* oklch */ color: oklch(48.2% 0.155 260.7);

Tailwind

colors: {
  custom: {
    50: '#7687cb',
    500: '#2559b4',
    950: '#000000',
  },
}

SCSS

$custom: #2559b4;
$custom-light: #7687cb;
$custom-dark: #000000;

JSON

{
  "hex": "#2559b4",
  "rgb": {
    "r": 37,
    "g": 89,
    "b": 180
  },
  "hsl": {
    "h": 218.182,
    "s": 65.899,
    "l": 42.549
  },
  "oklch": {
    "l": 0.48211,
    "c": 0.15513,
    "h": 260.7
  },
  "luminance": 0.10833
}

Semantic roles & 50–950 ramp

primary

#2559B4

secondary

#C9A76C

accent

#AB3FE9

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #2559B4

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

Preview Lab → · Contrast checker → · Palette generator →