#337FB3#337FB3

#337FB3 is a mid, moderate cyan. Relative luminance 0.191; OKLCH L 57.3% C 0.109 H 242.2°. Best body text is #000000 at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#337FB3
RGB	rgb(51, 127, 179)
HSL	hsl(204, 56%, 45%)
HSV	hsv(204, 72%, 70%)
CMYK	cmyk(71.5%, 29.1%, 0%, 29.8%)
CIE-LAB	lab(50.85, -5.93, -34.20)
CIE-LCH	lch(50.85, 34.71, 260.17°)
OKLab	oklab(57.32% -0.0509 -0.0966)
OKLCH	oklch(57.32% 0.109 242.2)
XYZ	xyz(17.0882, 19.1353, 45.4320)
Luminance	0.1914 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337FB3 #B36733

analogous

#33B3A7 #337FB3 #333FB3

triadic

#337FB3 #B3337F #7FB333

tetradic

#337FB3 #A733B3 #B36733 #3FB333

square

#337FB3 #A733B3 #B36733 #3FB333

split-complementary

#337FB3 #B3333F #B3A733

monochromatic

#183B54 #255D83 #337FB3 #559DCE #84B8DC

Accessibility & contrast

On white

4.35

#337FB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.83

#337FB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337FB3

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337FB3	#FFFFFF	#000000	##000000
##337FB3	1.00	4.35	4.83	4.83
#FFFFFF	4.35	1.00	21.00	21.00
#000000	4.83	21.00	1.00	1.00
##000000	4.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6780B5

Deuteranopia (green-blind)

#5674B2

Tritanopia (blue-blind)

#008C91

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #337fb3;
/* rgb */ color: rgb(51, 127, 179);
/* oklch */ color: oklch(57.3% 0.109 242.2);

Tailwind

colors: {
  custom: {
    50: '#7ba3ca',
    500: '#337fb3',
    950: '#000000',
  },
}

SCSS

$custom: #337fb3;
$custom-light: #7ba3ca;
$custom-dark: #000000;

JSON

{
  "hex": "#337fb3",
  "rgb": {
    "r": 51,
    "g": 127,
    "b": 179
  },
  "hsl": {
    "h": 204.375,
    "s": 55.652,
    "l": 45.098
  },
  "oklch": {
    "l": 0.57315,
    "c": 0.10923,
    "h": 242.2
  },
  "luminance": 0.19137
}

Semantic roles & 50–950 ramp

primary

#337FB3

secondary

#C69A7C

accent

#8649DF

background

#F8FAFC

surface

#EFF3F8

border

#CACDD1

text

#0A0F13

muted

#7C7F82

Preview Lab

Preview with #337FB3

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

Preview Lab → · Contrast checker → · Palette generator →