#2578B0#2578B0

#2578B0 is a mid, moderate cyan. Relative luminance 0.170; OKLCH L 55.1% C 0.116 H 243.2°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#2578B0
RGB	rgb(37, 120, 176)
HSL	hsl(204, 65%, 42%)
HSV	hsv(204, 79%, 69%)
CMYK	cmyk(79%, 31.8%, 0%, 31%)
CIE-LAB	lab(48.21, -4.69, -36.63)
CIE-LCH	lch(48.21, 36.93, 262.70°)
OKLab	oklab(55.08% -0.0526 -0.1039)
OKLCH	oklch(55.08% 0.116 243.2)
XYZ	xyz(15.3128, 16.9590, 43.5322)
Luminance	0.1696 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2578B0 #B05D25

analogous

#25B0A3 #2578B0 #2532B0

triadic

#2578B0 #B02578 #78B025

tetradic

#2578B0 #A325B0 #B05D25 #32B025

square

#2578B0 #A325B0 #B05D25 #32B025

split-complementary

#2578B0 #B02532 #B0A325

monochromatic

#10334B #1A567D #2578B0 #3C98D6 #6FB3E1

Accessibility & contrast

On white

4.78

#2578B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#2578B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2578B0

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2578B0	#FFFFFF	#000000	##FFFFFF
##2578B0	1.00	4.78	4.39	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E79B2

Deuteranopia (green-blind)

#4B6DAF

Tritanopia (blue-blind)

#00868C

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #2578b0;
/* rgb */ color: rgb(37, 120, 176);
/* oklch */ color: oklch(55.1% 0.116 243.2);

Tailwind

colors: {
  custom: {
    50: '#759ec8',
    500: '#2578b0',
    950: '#000000',
  },
}

SCSS

$custom: #2578b0;
$custom-light: #759ec8;
$custom-dark: #000000;

JSON

{
  "hex": "#2578b0",
  "rgb": {
    "r": 37,
    "g": 120,
    "b": 176
  },
  "hsl": {
    "h": 204.173,
    "s": 65.258,
    "l": 41.765
  },
  "oklch": {
    "l": 0.55075,
    "c": 0.11648,
    "h": 243.2
  },
  "luminance": 0.16961
}

Semantic roles & 50–950 ramp

primary

#2578B0

secondary

#C78F6A

accent

#8440E8

background

#F7F9FC

surface

#EEF2F8

border

#C9CCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #2578B0

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

Preview Lab → · Contrast checker → · Palette generator →