#3781D9#3781D9

#3781D9 is a mid, vivid cyan. Relative luminance 0.215; OKLCH L 60.1% C 0.153 H 254.8°. Best body text is #000000 at 5.30:1 contrast (WCAG AA passes).

Color values

HEX	#3781D9
RGB	rgb(55, 129, 217)
HSL	hsl(213, 68%, 53%)
HSV	hsv(213, 75%, 85%)
CMYK	cmyk(74.7%, 40.6%, 0%, 14.9%)
CIE-LAB	lab(53.51, 7.11, -51.63)
CIE-LCH	lch(53.51, 52.12, 277.84°)
OKLab	oklab(60.08% -0.0402 -0.1475)
OKLCH	oklch(60.08% 0.153 254.8)
XYZ	xyz(21.9455, 21.5200, 68.6294)
Luminance	0.2152 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3781D9 #D98F37

analogous

#37D2D9 #3781D9 #3E37D9

triadic

#3781D9 #D93781 #81D937

tetradic

#3781D9 #D937D2 #D98F37 #37D93E

square

#3781D9 #D937D2 #D98F37 #37D93E

split-complementary

#3781D9 #D93E37 #D2D937

monochromatic

#18467E #2263B1 #3781D9 #6AA1E3 #9EC2ED

Accessibility & contrast

On white

3.96

#3781D9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.30

#3781D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3781D9

5.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3781D9	#FFFFFF	#000000	##000000
##3781D9	1.00	3.96	5.30	5.30
#FFFFFF	3.96	1.00	21.00	21.00
#000000	5.30	21.00	1.00	1.00
##000000	5.30	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5788DC

Deuteranopia (green-blind)

#3C79D7

Tritanopia (blue-blind)

#0096A2

Achromatopsia (no color)

#808080

Design tokens & code

CSS

--color: #3781d9;
/* rgb */ color: rgb(55, 129, 217);
/* oklch */ color: oklch(60.1% 0.153 254.8);

Tailwind

colors: {
  custom: {
    50: '#83a5e5',
    500: '#3781d9',
    950: '#000000',
  },
}

SCSS

$custom: #3781d9;
$custom-light: #83a5e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3781d9",
  "rgb": {
    "r": 55,
    "g": 129,
    "b": 217
  },
  "hsl": {
    "h": 212.593,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.60084,
    "c": 0.15288,
    "h": 254.8
  },
  "luminance": 0.21522
}

Semantic roles & 50–950 ramp

primary

#3781D9

secondary

#D9B993

accent

#9B3DEB

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0C0F16

muted

#7D7F84

Preview Lab

Preview with #3781D9

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

Preview Lab → · Contrast checker → · Palette generator →