#3F74BB#3F74BB

#3F74BB is a mid, vivid cyan. Relative luminance 0.171; OKLCH L 55.7% C 0.125 H 256.4°. Best body text is #FFFFFF at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#3F74BB
RGB	rgb(63, 116, 187)
HSL	hsl(214, 50%, 49%)
HSV	hsv(214, 66%, 73%)
CMYK	cmyk(66.3%, 38%, 0%, 26.7%)
CIE-LAB	lab(48.43, 5.44, -42.60)
CIE-LCH	lch(48.43, 42.95, 277.28°)
OKLab	oklab(55.67% -0.0294 -0.1211)
OKLCH	oklch(55.67% 0.125 256.4)
XYZ	xyz(17.2617, 17.1337, 49.4015)
Luminance	0.1714 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74BB #BB863F

analogous

#3FB2BB #3F74BB #483FBB

triadic

#3F74BB #BB3F74 #74BB3F

tetradic

#3F74BB #BB3FB2 #BB863F #3FBB48

square

#3F74BB #BB3FB2 #BB863F #3FBB48

split-complementary

#3F74BB #BB483F #B2BB3F

monochromatic

#203B5F #30588D #3F74BB #6A94CD #98B5DC

Accessibility & contrast

On white

4.74

#3F74BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.43

#3F74BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F74BB

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74BB	#FFFFFF	#000000	##FFFFFF
##3F74BB	1.00	4.74	4.43	4.74
#FFFFFF	4.74	1.00	21.00	1.00
#000000	4.43	21.00	1.00	21.00
##FFFFFF	4.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5479BE

Deuteranopia (green-blind)

#426EBA

Tritanopia (blue-blind)

#00848E

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f74bb;
/* rgb */ color: rgb(63, 116, 187);
/* oklch */ color: oklch(55.7% 0.125 256.4);

Tailwind

colors: {
  custom: {
    50: '#819bd0',
    500: '#3f74bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f74bb;
$custom-light: #819bd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74bb",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 187
  },
  "hsl": {
    "h": 214.355,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.55668,
    "c": 0.12463,
    "h": 256.4
  },
  "luminance": 0.17135
}

Semantic roles & 50–950 ramp

primary

#3F74BB

secondary

#C8AF8E

accent

#9E4FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F74BB

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

Preview Lab → · Contrast checker → · Palette generator →