#2578B1#2578B1

#2578B1 is a mid, moderate cyan. Relative luminance 0.170; OKLCH L 55.1% C 0.118 H 243.6°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#2578B1
RGB	rgb(37, 120, 177)
HSL	hsl(204, 65%, 42%)
HSV	hsv(204, 79%, 69%)
CMYK	cmyk(79.1%, 32.2%, 0%, 30.6%)
CIE-LAB	lab(48.26, -4.32, -37.13)
CIE-LCH	lch(48.26, 37.39, 263.36°)
OKLab	oklab(55.13% -0.0523 -0.1054)
OKLCH	oklch(55.13% 0.118 243.6)
XYZ	xyz(15.4121, 16.9987, 44.0552)
Luminance	0.1700 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2578B1 #B15E25

analogous

#25B1A4 #2578B1 #2532B1

triadic

#2578B1 #B12578 #78B125

tetradic

#2578B1 #A425B1 #B15E25 #32B125

square

#2578B1 #A425B1 #B15E25 #32B125

split-complementary

#2578B1 #B12532 #B1A425

monochromatic

#10334C #1A567E #2578B1 #3D98D6 #6FB3E1

Accessibility & contrast

On white

4.77

#2578B1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#2578B1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2578B1

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2578B1	#FFFFFF	#000000	##FFFFFF
##2578B1	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D7AB3

Deuteranopia (green-blind)

#4A6DB0

Tritanopia (blue-blind)

#00868C

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #2578b1;
/* rgb */ color: rgb(37, 120, 177);
/* oklch */ color: oklch(55.1% 0.118 243.6);

Tailwind

colors: {
  custom: {
    50: '#759ec8',
    500: '#2578b1',
    950: '#000000',
  },
}

SCSS

$custom: #2578b1;
$custom-light: #759ec8;
$custom-dark: #000000;

JSON

{
  "hex": "#2578b1",
  "rgb": {
    "r": 37,
    "g": 120,
    "b": 177
  },
  "hsl": {
    "h": 204.429,
    "s": 65.421,
    "l": 41.961
  },
  "oklch": {
    "l": 0.55131,
    "c": 0.11764,
    "h": 243.6
  },
  "luminance": 0.17001
}

Semantic roles & 50–950 ramp

primary

#2578B1

secondary

#C8906A

accent

#843FE8

background

#F7F9FC

surface

#EEF2F8

border

#C9CCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #2578B1

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

Preview Lab → · Contrast checker → · Palette generator →