#309BB4#309BB4

#309BB4 is a light, moderate cyan. Relative luminance 0.274; OKLCH L 64.1% C 0.100 H 217.0°. Best body text is #000000 at 6.47:1 contrast (WCAG AA passes).

Color values

HEX	#309BB4
RGB	rgb(48, 155, 180)
HSL	hsl(191, 58%, 45%)
HSV	hsv(191, 73%, 71%)
CMYK	cmyk(73.3%, 13.9%, 0%, 29.4%)
CIE-LAB	lab(59.31, -21.50, -21.67)
CIE-LCH	lch(59.31, 30.52, 225.22°)
OKLab	oklab(64.06% -0.0803 -0.0604)
OKLCH	oklch(64.06% 0.1 217)
XYZ	xyz(21.1750, 27.3639, 47.3369)
Luminance	0.2737 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#309BB4 #B44930

analogous

#30B48B #309BB4 #3059B4

triadic

#309BB4 #B4309B #9BB430

tetradic

#309BB4 #8B30B4 #B44930 #59B430

square

#309BB4 #8B30B4 #B44930 #59B430

split-complementary

#309BB4 #B43059 #B48B30

monochromatic

#164853 #237184 #309BB4 #51B8D1 #81CCDD

Accessibility & contrast

On white

3.24

#309BB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.47

#309BB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #309BB4

6.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##309BB4	#FFFFFF	#000000	##000000
##309BB4	1.00	3.24	6.47	6.47
#FFFFFF	3.24	1.00	21.00	21.00
#000000	6.47	21.00	1.00	1.00
##000000	6.47	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#8A96B5

Deuteranopia (green-blind)

#7889B4

Tritanopia (blue-blind)

#00A4A3

Achromatopsia (no color)

#8F8F8F

Design tokens & code

CSS

--color: #309bb4;
/* rgb */ color: rgb(48, 155, 180);
/* oklch */ color: oklch(64.1% 0.100 217.0);

Tailwind

colors: {
  custom: {
    50: '#7bb8ca',
    500: '#309bb4',
    950: '#000000',
  },
}

SCSS

$custom: #309bb4;
$custom-light: #7bb8ca;
$custom-dark: #000000;

JSON

{
  "hex": "#309bb4",
  "rgb": {
    "r": 48,
    "g": 155,
    "b": 180
  },
  "hsl": {
    "h": 191.364,
    "s": 57.895,
    "l": 44.706
  },
  "oklch": {
    "l": 0.64063,
    "c": 0.10049,
    "h": 217
  },
  "luminance": 0.27366
}

Semantic roles & 50–950 ramp

primary

#309BB4

secondary

#C68879

accent

#6447E1

background

#F8FBFC

surface

#EFF6F8

border

#CAD0D1

text

#0B1113

muted

#7C8082

Preview Lab

Preview with #309BB4

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

Preview Lab → · Contrast checker → · Palette generator →