#2551B5#2551B5

#2551B5 is a mid, vivid blue. Relative luminance 0.096; OKLCH L 46.6% C 0.166 H 263.4°. Best body text is #FFFFFF at 7.18:1 contrast (WCAG AA passes).

Color values

HEX	#2551B5
RGB	rgb(37, 81, 181)
HSL	hsl(222, 66%, 43%)
HSV	hsv(222, 80%, 71%)
CMYK	cmyk(79.6%, 55.2%, 0%, 29%)
CIE-LAB	lab(37.14, 22.09, -57.28)
CIE-LCH	lch(37.14, 61.39, 291.09°)
OKLab	oklab(46.59% -0.0191 -0.1653)
OKLCH	oklch(46.59% 0.166 263.4)
XYZ	xyz(12.0429, 9.6130, 44.9279)
Luminance	0.0961 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2551B5 #B58925

analogous

#2599B5 #2551B5 #4125B5

triadic

#2551B5 #B52551 #51B525

tetradic

#2551B5 #B52599 #B58925 #25B541

square

#2551B5 #B52599 #B58925 #25B541

split-complementary

#2551B5 #B54125 #99B525

monochromatic

#10244F #1B3A82 #2551B5 #3F6ED8 #7294E2

Accessibility & contrast

On white

7.18

#2551B5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.92

#2551B5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2551B5

7.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2551B5	#FFFFFF	#000000	##FFFFFF
##2551B5	1.00	7.18	2.92	7.18
#FFFFFF	7.18	1.00	21.00	1.00
#000000	2.92	21.00	1.00	21.00
##FFFFFF	7.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005EB8

Deuteranopia (green-blind)

#0051B3

Tritanopia (blue-blind)

#006A7B

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #2551b5;
/* rgb */ color: rgb(37, 81, 181);
/* oklch */ color: oklch(46.6% 0.166 263.4);

Tailwind

colors: {
  custom: {
    50: '#7781cc',
    500: '#2551b5',
    950: '#000000',
  },
}

SCSS

$custom: #2551b5;
$custom-light: #7781cc;
$custom-dark: #000000;

JSON

{
  "hex": "#2551b5",
  "rgb": {
    "r": 37,
    "g": 81,
    "b": 181
  },
  "hsl": {
    "h": 221.667,
    "s": 66.055,
    "l": 42.745
  },
  "oklch": {
    "l": 0.46593,
    "c": 0.16636,
    "h": 263.4
  },
  "luminance": 0.09614
}

Semantic roles & 50–950 ramp

primary

#2551B5

secondary

#C9AD6D

accent

#B53FE9

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #2551B5

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

Preview Lab → · Contrast checker → · Palette generator →