#2551B0#2551B0

#2551B0 is a mid, vivid blue. Relative luminance 0.094; OKLCH L 46.2% C 0.160 H 263.0°. Best body text is #FFFFFF at 7.29:1 contrast (WCAG AA passes).

Color values

HEX	#2551B0
RGB	rgb(37, 81, 176)
HSL	hsl(221, 65%, 42%)
HSV	hsv(221, 79%, 69%)
CMYK	cmyk(79%, 54%, 0%, 31%)
CIE-LAB	lab(36.76, 20.14, -54.93)
CIE-LCH	lch(36.76, 58.51, 290.14°)
OKLab	oklab(46.19% -0.0195 -0.1584)
OKLCH	oklch(46.19% 0.16 263)
XYZ	xyz(11.5390, 9.4114, 42.2743)
Luminance	0.0941 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2551B0 #B08425

analogous

#2597B0 #2551B0 #3F25B0

triadic

#2551B0 #B02551 #51B025

tetradic

#2551B0 #B02597 #B08425 #25B03F

square

#2551B0 #B02597 #B08425 #25B03F

split-complementary

#2551B0 #B03F25 #97B025

monochromatic

#10224B #1A3A7D #2551B0 #3C6DD6 #6F93E1

Accessibility & contrast

On white

7.29

#2551B0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#2551B0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2551B0

7.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2551B0	#FFFFFF	#000000	##FFFFFF
##2551B0	1.00	7.29	2.88	7.29
#FFFFFF	7.29	1.00	21.00	1.00
#000000	2.88	21.00	1.00	21.00
##FFFFFF	7.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#025DB3

Deuteranopia (green-blind)

#0050AE

Tritanopia (blue-blind)

#006878

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #2551b0;
/* rgb */ color: rgb(37, 81, 176);
/* oklch */ color: oklch(46.2% 0.160 263.0);

Tailwind

colors: {
  custom: {
    50: '#7681c8',
    500: '#2551b0',
    950: '#000000',
  },
}

SCSS

$custom: #2551b0;
$custom-light: #7681c8;
$custom-dark: #000000;

JSON

{
  "hex": "#2551b0",
  "rgb": {
    "r": 37,
    "g": 81,
    "b": 176
  },
  "hsl": {
    "h": 221.007,
    "s": 65.258,
    "l": 41.765
  },
  "oklch": {
    "l": 0.46192,
    "c": 0.15956,
    "h": 263
  },
  "luminance": 0.09413
}

Semantic roles & 50–950 ramp

primary

#2551B0

secondary

#C7AA6A

accent

#B340E8

background

#F7F7FC

surface

#EEEEF8

border

#C9C9D1

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #2551B0

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

Preview Lab → · Contrast checker → · Palette generator →