#377BD9#377BD9

#377BD9 is a mid, vivid cyan. Relative luminance 0.200; OKLCH L 58.8% C 0.159 H 257.3°. Best body text is #000000 at 5.00:1 contrast (WCAG AA passes).

Color values

HEX	#377BD9
RGB	rgb(55, 123, 217)
HSL	hsl(215, 68%, 53%)
HSV	hsv(215, 75%, 85%)
CMYK	cmyk(74.7%, 43.3%, 0%, 14.9%)
CIE-LAB	lab(51.82, 10.79, -54.33)
CIE-LCH	lch(51.82, 55.40, 281.24°)
OKLab	oklab(58.77% -0.035 -0.1556)
OKLCH	oklch(58.77% 0.159 257.3)
XYZ	xyz(21.1783, 19.9855, 68.3736)
Luminance	0.1999 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#377BD9 #D99537

analogous

#37CCD9 #377BD9 #4437D9

triadic

#377BD9 #D9377B #7BD937

tetradic

#377BD9 #D937CC #D99537 #37D944

square

#377BD9 #D937CC #D99537 #37D944

split-complementary

#377BD9 #D94437 #CCD937

monochromatic

#18437E #225EB1 #377BD9 #6A9DE3 #9EBFED

Accessibility & contrast

On white

4.20

#377BD9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.00

#377BD9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #377BD9

5.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##377BD9	#FFFFFF	#000000	##000000
##377BD9	1.00	4.20	5.00	5.00
#FFFFFF	4.20	1.00	21.00	21.00
#000000	5.00	21.00	1.00	1.00
##000000	5.00	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C84DD

Deuteranopia (green-blind)

#2D75D7

Tritanopia (blue-blind)

#00919F

Achromatopsia (no color)

#7C7C7C

Design tokens & code

CSS

--color: #377bd9;
/* rgb */ color: rgb(55, 123, 217);
/* oklch */ color: oklch(58.8% 0.159 257.3);

Tailwind

colors: {
  custom: {
    50: '#83a0e5',
    500: '#377bd9',
    950: '#000000',
  },
}

SCSS

$custom: #377bd9;
$custom-light: #83a0e5;
$custom-dark: #000000;

JSON

{
  "hex": "#377bd9",
  "rgb": {
    "r": 55,
    "g": 123,
    "b": 217
  },
  "hsl": {
    "h": 214.815,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.5877,
    "c": 0.15946,
    "h": 257.3
  },
  "luminance": 0.19988
}

Semantic roles & 50–950 ramp

primary

#377BD9

secondary

#D9BB93

accent

#A23DEB

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0E16

muted

#7D7E84

Preview Lab

Preview with #377BD9

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

Preview Lab → · Contrast checker → · Palette generator →