#2551BB#2551BB

#2551BB is a mid, vivid blue. Relative luminance 0.099; OKLCH L 47.1% C 0.174 H 263.9°. Best body text is #FFFFFF at 7.06:1 contrast (WCAG AA passes).

Color values

HEX	#2551BB
RGB	rgb(37, 81, 187)
HSL	hsl(222, 67%, 44%)
HSV	hsv(222, 80%, 73%)
CMYK	cmyk(80.2%, 56.7%, 0%, 26.7%)
CIE-LAB	lab(37.60, 24.40, -60.06)
CIE-LCH	lch(37.60, 64.83, 292.11°)
OKLab	oklab(47.08% -0.0186 -0.1734)
OKLCH	oklch(47.08% 0.174 263.9)
XYZ	xyz(12.6718, 9.8645, 48.2403)
Luminance	0.0987 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2551BB #BB8F25

analogous

#259CBB #2551BB #4425BB

triadic

#2551BB #BB2551 #51BB25

tetradic

#2551BB #BB259C #BB8F25 #25BB44

square

#2551BB #BB259C #BB8F25 #25BB44

split-complementary

#2551BB #BB4425 #9CBB25

monochromatic

#112555 #1B3B88 #2551BB #436FDA #7697E4

Accessibility & contrast

On white

7.06

#2551BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.97

#2551BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2551BB

7.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2551BB	#FFFFFF	#000000	##FFFFFF
##2551BB	1.00	7.06	2.97	7.06
#FFFFFF	7.06	1.00	21.00	1.00
#000000	2.97	21.00	1.00	21.00
##FFFFFF	7.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060BF

Deuteranopia (green-blind)

#0052B9

Tritanopia (blue-blind)

#006B7E

Achromatopsia (no color)

#585858

Design tokens & code

CSS

--color: #2551bb;
/* rgb */ color: rgb(37, 81, 187);
/* oklch */ color: oklch(47.1% 0.174 263.9);

Tailwind

colors: {
  custom: {
    50: '#7881d0',
    500: '#2551bb',
    950: '#000000',
  },
}

SCSS

$custom: #2551bb;
$custom-light: #7881d0;
$custom-dark: #000000;

JSON

{
  "hex": "#2551bb",
  "rgb": {
    "r": 37,
    "g": 81,
    "b": 187
  },
  "hsl": {
    "h": 222.4,
    "s": 66.964,
    "l": 43.922
  },
  "oklch": {
    "l": 0.47084,
    "c": 0.17443,
    "h": 263.9
  },
  "luminance": 0.09866
}

Semantic roles & 50–950 ramp

primary

#2551BB

secondary

#CBB170

accent

#B73EEA

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #2551BB

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

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