#3F77BB#3F77BB

#3F77BB is a mid, vivid cyan. Relative luminance 0.178; OKLCH L 56.3% C 0.121 H 254.5°. Best body text is #FFFFFF at 4.60:1 contrast (WCAG AA passes).

Color values

HEX	#3F77BB
RGB	rgb(63, 119, 187)
HSL	hsl(213, 50%, 49%)
HSV	hsv(213, 66%, 73%)
CMYK	cmyk(66.3%, 36.4%, 0%, 26.7%)
CIE-LAB	lab(49.30, 3.61, -41.22)
CIE-LCH	lch(49.30, 41.38, 275.00°)
OKLab	oklab(56.35% -0.0324 -0.117)
OKLCH	oklch(56.35% 0.121 254.5)
XYZ	xyz(17.6131, 17.8365, 49.5186)
Luminance	0.1784 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F77BB #BB833F

analogous

#3FB5BB #3F77BB #453FBB

triadic

#3F77BB #BB3F77 #77BB3F

tetradic

#3F77BB #BB3FB5 #BB833F #3FBB45

square

#3F77BB #BB3FB5 #BB833F #3FBB45

split-complementary

#3F77BB #BB453F #B5BB3F

monochromatic

#203D5F #305A8D #3F77BB #6A97CD #98B7DC

Accessibility & contrast

On white

4.60

#3F77BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#3F77BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F77BB

4.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F77BB	#FFFFFF	#000000	##FFFFFF
##3F77BB	1.00	4.60	4.57	4.60
#FFFFFF	4.60	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#597CBE

Deuteranopia (green-blind)

#4770BA

Tritanopia (blue-blind)

#008790

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f77bb;
/* rgb */ color: rgb(63, 119, 187);
/* oklch */ color: oklch(56.3% 0.121 254.5);

Tailwind

colors: {
  custom: {
    50: '#819dd0',
    500: '#3f77bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f77bb;
$custom-light: #819dd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f77bb",
  "rgb": {
    "r": 63,
    "g": 119,
    "b": 187
  },
  "hsl": {
    "h": 212.903,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.56346,
    "c": 0.12146,
    "h": 254.5
  },
  "luminance": 0.17838
}

Semantic roles & 50–950 ramp

primary

#3F77BB

secondary

#C8AE8E

accent

#9B4FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F77BB

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

Preview Lab → · Contrast checker → · Palette generator →