#3F77BC#3F77BC

#3F77BC is a mid, vivid cyan. Relative luminance 0.179; OKLCH L 56.4% C 0.123 H 254.8°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#3F77BC
RGB	rgb(63, 119, 188)
HSL	hsl(213, 50%, 49%)
HSV	hsv(213, 66%, 74%)
CMYK	cmyk(66.5%, 36.7%, 0%, 26.3%)
CIE-LAB	lab(49.35, 3.96, -41.72)
CIE-LCH	lch(49.35, 41.90, 275.42°)
OKLab	oklab(56.4% -0.0322 -0.1185)
OKLCH	oklch(56.4% 0.123 254.8)
XYZ	xyz(17.7205, 17.8795, 50.0844)
Luminance	0.1788 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F77BC #BC843F

analogous

#3FB6BC #3F77BC #463FBC

triadic

#3F77BC #BC3F77 #77BC3F

tetradic

#3F77BC #BC3FB6 #BC843F #3FBC46

square

#3F77BC #BC3FB6 #BC843F #3FBC46

split-complementary

#3F77BC #BC463F #B6BC3F

monochromatic

#203D60 #305A8E #3F77BC #6B97CD #99B7DD

Accessibility & contrast

On white

4.59

#3F77BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#3F77BC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F77BC

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F77BC	#FFFFFF	#000000	##FFFFFF
##3F77BC	1.00	4.59	4.58	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.58	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#587CBF

Deuteranopia (green-blind)

#4770BB

Tritanopia (blue-blind)

#008790

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f77bc;
/* rgb */ color: rgb(63, 119, 188);
/* oklch */ color: oklch(56.4% 0.123 254.8);

Tailwind

colors: {
  custom: {
    50: '#819dd0',
    500: '#3f77bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f77bc;
$custom-light: #819dd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f77bc",
  "rgb": {
    "r": 63,
    "g": 119,
    "b": 188
  },
  "hsl": {
    "h": 213.12,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.56404,
    "c": 0.12278,
    "h": 254.8
  },
  "luminance": 0.17881
}

Semantic roles & 50–950 ramp

primary

#3F77BC

secondary

#C9AE8E

accent

#9B4ED9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F77BC

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

Preview Lab → · Contrast checker → · Palette generator →