#2557B1#2557B1

#2557B1 is a mid, vivid blue. Relative luminance 0.104; OKLCH L 47.6% C 0.153 H 261.0°. Best body text is #FFFFFF at 6.83:1 contrast (WCAG AA passes).

Color values

HEX	#2557B1
RGB	rgb(37, 87, 177)
HSL	hsl(219, 65%, 42%)
HSV	hsv(219, 79%, 69%)
CMYK	cmyk(79.1%, 50.8%, 0%, 30.6%)
CIE-LAB	lab(38.52, 16.55, -52.68)
CIE-LCH	lch(38.52, 55.22, 287.44°)
OKLab	oklab(47.55% -0.0239 -0.1516)
OKLCH	oklch(47.55% 0.153 261)
XYZ	xyz(12.1041, 10.3826, 42.9526)
Luminance	0.1038 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2557B1 #B17F25

analogous

#259DB1 #2557B1 #3925B1

triadic

#2557B1 #B12557 #57B125

tetradic

#2557B1 #B1259D #B17F25 #25B139

square

#2557B1 #B1259D #B17F25 #25B139

split-complementary

#2557B1 #B13925 #9DB125

monochromatic

#10254C #1A3E7E #2557B1 #3D74D6 #6F98E1

Accessibility & contrast

On white

6.83

#2557B1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#2557B1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2557B1

6.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2557B1	#FFFFFF	#000000	##FFFFFF
##2557B1	1.00	6.83	3.08	6.83
#FFFFFF	6.83	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E61B4

Deuteranopia (green-blind)

#0055AF

Tritanopia (blue-blind)

#006D7B

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #2557b1;
/* rgb */ color: rgb(37, 87, 177);
/* oklch */ color: oklch(47.6% 0.153 261.0);

Tailwind

colors: {
  custom: {
    50: '#7685c9',
    500: '#2557b1',
    950: '#000000',
  },
}

SCSS

$custom: #2557b1;
$custom-light: #7685c9;
$custom-dark: #000000;

JSON

{
  "hex": "#2557b1",
  "rgb": {
    "r": 37,
    "g": 87,
    "b": 177
  },
  "hsl": {
    "h": 218.571,
    "s": 65.421,
    "l": 41.961
  },
  "oklch": {
    "l": 0.47551,
    "c": 0.15349,
    "h": 261
  },
  "luminance": 0.10384
}

Semantic roles & 50–950 ramp

primary

#2557B1

secondary

#C8A66A

accent

#AC3FE8

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #2557B1

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

Preview Lab → · Contrast checker → · Palette generator →