#2557B5#2557B5

#2557B5 is a mid, vivid blue. Relative luminance 0.105; OKLCH L 47.9% C 0.159 H 261.5°. Best body text is #FFFFFF at 6.75:1 contrast (WCAG AA passes).

Color values

HEX	#2557B5
RGB	rgb(37, 87, 181)
HSL	hsl(219, 66%, 43%)
HSV	hsv(219, 80%, 71%)
CMYK	cmyk(79.6%, 51.9%, 0%, 29%)
CIE-LAB	lab(38.80, 18.11, -54.58)
CIE-LCH	lch(38.80, 57.51, 288.36°)
OKLab	oklab(47.86% -0.0234 -0.1572)
OKLCH	oklch(47.86% 0.159 261.5)
XYZ	xyz(12.5086, 10.5444, 45.0831)
Luminance	0.1055 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2557B5 #B58325

analogous

#259FB5 #2557B5 #3B25B5

triadic

#2557B5 #B52557 #57B525

tetradic

#2557B5 #B5259F #B58325 #25B53B

square

#2557B5 #B5259F #B58325 #25B53B

split-complementary

#2557B5 #B53B25 #9FB525

monochromatic

#10264F #1B3F82 #2557B5 #3F74D8 #7299E2

Accessibility & contrast

On white

6.75

#2557B5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#2557B5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2557B5

6.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2557B5	#FFFFFF	#000000	##FFFFFF
##2557B5	1.00	6.75	3.11	6.75
#FFFFFF	6.75	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1762B8

Deuteranopia (green-blind)

#0055B3

Tritanopia (blue-blind)

#006E7D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #2557b5;
/* rgb */ color: rgb(37, 87, 181);
/* oklch */ color: oklch(47.9% 0.159 261.5);

Tailwind

colors: {
  custom: {
    50: '#7785cc',
    500: '#2557b5',
    950: '#000000',
  },
}

SCSS

$custom: #2557b5;
$custom-light: #7785cc;
$custom-dark: #000000;

JSON

{
  "hex": "#2557b5",
  "rgb": {
    "r": 37,
    "g": 87,
    "b": 181
  },
  "hsl": {
    "h": 219.167,
    "s": 66.055,
    "l": 42.745
  },
  "oklch": {
    "l": 0.47856,
    "c": 0.15894,
    "h": 261.5
  },
  "luminance": 0.10546
}

Semantic roles & 50–950 ramp

primary

#2557B5

secondary

#C9A96D

accent

#AE3FE9

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #2557B5

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

Preview Lab → · Contrast checker → · Palette generator →