#2563BB#2563BB

#2563BB is a mid, vivid blue. Relative luminance 0.129; OKLCH L 50.9% C 0.153 H 258.0°. Best body text is #FFFFFF at 5.86:1 contrast (WCAG AA passes).

Color values

HEX	#2563BB
RGB	rgb(37, 99, 187)
HSL	hsl(215, 67%, 44%)
HSV	hsv(215, 80%, 73%)
CMYK	cmyk(80.2%, 47.1%, 0%, 26.7%)
CIE-LAB	lab(42.62, 12.60, -51.94)
CIE-LCH	lch(42.62, 53.44, 283.63°)
OKLab	oklab(50.91% -0.0317 -0.1492)
OKLCH	oklch(50.91% 0.153 258)
XYZ	xyz(14.1911, 12.9031, 48.7467)
Luminance	0.1290 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2563BB #BB7D25

analogous

#25AEBB #2563BB #3225BB

triadic

#2563BB #BB2563 #63BB25

tetradic

#2563BB #BB25AE #BB7D25 #25BB32

square

#2563BB #BB25AE #BB7D25 #25BB32

split-complementary

#2563BB #BB3225 #AEBB25

monochromatic

#112D55 #1B4888 #2563BB #4382DA #76A4E4

Accessibility & contrast

On white

5.86

#2563BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.58

#2563BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2563BB

5.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2563BB	#FFFFFF	#000000	##FFFFFF
##2563BB	1.00	5.86	3.58	5.86
#FFFFFF	5.86	1.00	21.00	1.00
#000000	3.58	21.00	1.00	21.00
##FFFFFF	5.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#326CBE

Deuteranopia (green-blind)

#035EB9

Tritanopia (blue-blind)

#007886

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #2563bb;
/* rgb */ color: rgb(37, 99, 187);
/* oklch */ color: oklch(50.9% 0.153 258.0);

Tailwind

colors: {
  custom: {
    50: '#778ed0',
    500: '#2563bb',
    950: '#000000',
  },
}

SCSS

$custom: #2563bb;
$custom-light: #778ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#2563bb",
  "rgb": {
    "r": 37,
    "g": 99,
    "b": 187
  },
  "hsl": {
    "h": 215.2,
    "s": 66.964,
    "l": 43.922
  },
  "oklch": {
    "l": 0.5091,
    "c": 0.15253,
    "h": 258
  },
  "luminance": 0.12905
}

Semantic roles & 50–950 ramp

primary

#2563BB

secondary

#CBA670

accent

#A33EEA

background

#F7F8FC

surface

#EEF0F9

border

#C9CBD2

text

#0A0C14

muted

#7C7D82

Preview Lab

Preview with #2563BB

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

Preview Lab → · Contrast checker → · Palette generator →