#2557B0#2557B0

#2557B0 is a mid, vivid blue. Relative luminance 0.103; OKLCH L 47.5% C 0.152 H 260.9°. Best body text is #FFFFFF at 6.84:1 contrast (WCAG AA passes).

Color values

HEX	#2557B0
RGB	rgb(37, 87, 176)
HSL	hsl(218, 65%, 42%)
HSV	hsv(218, 79%, 69%)
CMYK	cmyk(79%, 50.6%, 0%, 31%)
CIE-LAB	lab(38.45, 16.16, -52.20)
CIE-LCH	lch(38.45, 54.65, 287.20°)
OKLab	oklab(47.48% -0.024 -0.1502)
OKLCH	oklch(47.48% 0.152 260.9)
XYZ	xyz(12.0048, 10.3429, 42.4296)
Luminance	0.1034 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2557B0 #B07E25

analogous

#259DB0 #2557B0 #3825B0

triadic

#2557B0 #B02557 #57B025

tetradic

#2557B0 #B0259D #B07E25 #25B038

square

#2557B0 #B0259D #B07E25 #25B038

split-complementary

#2557B0 #B03825 #9DB025

monochromatic

#10254B #1A3E7D #2557B0 #3C74D6 #6F98E1

Accessibility & contrast

On white

6.84

#2557B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#2557B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2557B0

6.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2557B0	#FFFFFF	#000000	##FFFFFF
##2557B0	1.00	6.84	3.07	6.84
#FFFFFF	6.84	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2061B3

Deuteranopia (green-blind)

#0055AE

Tritanopia (blue-blind)

#006C7B

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #2557b0;
/* rgb */ color: rgb(37, 87, 176);
/* oklch */ color: oklch(47.5% 0.152 260.9);

Tailwind

colors: {
  custom: {
    50: '#7585c8',
    500: '#2557b0',
    950: '#000000',
  },
}

SCSS

$custom: #2557b0;
$custom-light: #7585c8;
$custom-dark: #000000;

JSON

{
  "hex": "#2557b0",
  "rgb": {
    "r": 37,
    "g": 87,
    "b": 176
  },
  "hsl": {
    "h": 218.417,
    "s": 65.258,
    "l": 41.765
  },
  "oklch": {
    "l": 0.47476,
    "c": 0.15212,
    "h": 260.9
  },
  "luminance": 0.10344
}

Semantic roles & 50–950 ramp

primary

#2557B0

secondary

#C7A66A

accent

#AC40E8

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #2557B0

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

Preview Lab → · Contrast checker → · Palette generator →