#2559B3#2559B3

#2559B3 is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.1% C 0.154 H 260.6°. Best body text is #FFFFFF at 6.65:1 contrast (WCAG AA passes).

Color values

HEX	#2559B3
RGB	rgb(37, 89, 179)
HSL	hsl(218, 66%, 42%)
HSV	hsv(218, 79%, 70%)
CMYK	cmyk(79.3%, 50.3%, 0%, 29.8%)
CIE-LAB	lab(39.23, 16.01, -52.72)
CIE-LCH	lch(39.23, 55.10, 286.90°)
OKLab	oklab(48.14% -0.0252 -0.1517)
OKLCH	oklch(48.14% 0.154 260.6)
XYZ	xyz(12.4691, 10.7913, 44.0648)
Luminance	0.1079 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2559B3 #B37F25

analogous

#25A0B3 #2559B3 #3825B3

triadic

#2559B3 #B32559 #59B325

tetradic

#2559B3 #B325A0 #B37F25 #25B338

square

#2559B3 #B325A0 #B37F25 #25B338

split-complementary

#2559B3 #B33825 #A0B325

monochromatic

#10274E #1B4080 #2559B3 #3E76D7 #719AE2

Accessibility & contrast

On white

6.65

#2559B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.16

#2559B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2559B3

6.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2559B3	#FFFFFF	#000000	##FFFFFF
##2559B3	1.00	6.65	3.16	6.65
#FFFFFF	6.65	1.00	21.00	1.00
#000000	3.16	21.00	1.00	21.00
##FFFFFF	6.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2263B6

Deuteranopia (green-blind)

#0056B1

Tritanopia (blue-blind)

#006F7D

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #2559b3;
/* rgb */ color: rgb(37, 89, 179);
/* oklch */ color: oklch(48.1% 0.154 260.6);

Tailwind

colors: {
  custom: {
    50: '#7687ca',
    500: '#2559b3',
    950: '#000000',
  },
}

SCSS

$custom: #2559b3;
$custom-light: #7687ca;
$custom-dark: #000000;

JSON

{
  "hex": "#2559b3",
  "rgb": {
    "r": 37,
    "g": 89,
    "b": 179
  },
  "hsl": {
    "h": 218.028,
    "s": 65.741,
    "l": 42.353
  },
  "oklch": {
    "l": 0.48136,
    "c": 0.15377,
    "h": 260.6
  },
  "luminance": 0.10793
}

Semantic roles & 50–950 ramp

primary

#2559B3

secondary

#C8A66B

accent

#AB3FE9

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #2559B3

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

Preview Lab → · Contrast checker → · Palette generator →