#337FBB#337FBB

#337FBB is a mid, moderate cyan. Relative luminance 0.195; OKLCH L 57.7% C 0.119 H 245.9°. Best body text is #000000 at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#337FBB
RGB	rgb(51, 127, 187)
HSL	hsl(206, 57%, 47%)
HSV	hsv(206, 73%, 73%)
CMYK	cmyk(72.7%, 32.1%, 0%, 26.7%)
CIE-LAB	lab(51.23, -3.08, -38.20)
CIE-LCH	lch(51.23, 38.32, 265.39°)
OKLab	oklab(57.75% -0.0485 -0.1083)
OKLCH	oklch(57.75% 0.119 245.9)
XYZ	xyz(17.9208, 19.4684, 49.8174)
Luminance	0.1947 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337FBB #BB6F33

analogous

#33BBB3 #337FBB #333BBB

triadic

#337FBB #BB337F #7FBB33

tetradic

#337FBB #B333BB #BB6F33 #3BBB33

square

#337FBB #B333BB #BB6F33 #3BBB33

split-complementary

#337FBB #BB333B #BBB333

monochromatic

#193E5B #265E8B #337FBB #599DD2 #89B9DF

Accessibility & contrast

On white

4.29

#337FBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.89

#337FBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337FBB

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337FBB	#FFFFFF	#000000	##000000
##337FBB	1.00	4.29	4.89	4.89
#FFFFFF	4.29	1.00	21.00	21.00
#000000	4.89	21.00	1.00	1.00
##000000	4.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6481BE

Deuteranopia (green-blind)

#5174BA

Tritanopia (blue-blind)

#008D94

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #337fbb;
/* rgb */ color: rgb(51, 127, 187);
/* oklch */ color: oklch(57.7% 0.119 245.9);

Tailwind

colors: {
  custom: {
    50: '#7ca3cf',
    500: '#337fbb',
    950: '#000000',
  },
}

SCSS

$custom: #337fbb;
$custom-light: #7ca3cf;
$custom-dark: #000000;

JSON

{
  "hex": "#337fbb",
  "rgb": {
    "r": 51,
    "g": 127,
    "b": 187
  },
  "hsl": {
    "h": 206.471,
    "s": 57.143,
    "l": 46.667
  },
  "oklch": {
    "l": 0.57746,
    "c": 0.11861,
    "h": 245.9
  },
  "luminance": 0.1947
}

Semantic roles & 50–950 ramp

primary

#337FBB

secondary

#C9A181

accent

#8B47E0

background

#F8FAFC

surface

#EFF3F9

border

#CACDD2

text

#0B0F14

muted

#7C7F82

Preview Lab

Preview with #337FBB

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

Preview Lab → · Contrast checker → · Palette generator →