#3F66BE#3F66BE

#3F66BE is a mid, vivid blue. Relative luminance 0.143; OKLCH L 52.8% C 0.145 H 264.1°. Best body text is #FFFFFF at 5.45:1 contrast (WCAG AA passes).

Color values

HEX	#3F66BE
RGB	rgb(63, 102, 190)
HSL	hsl(222, 50%, 50%)
HSV	hsv(222, 67%, 75%)
CMYK	cmyk(66.8%, 46.3%, 0%, 25.5%)
CIE-LAB	lab(44.63, 15.29, -50.40)
CIE-LCH	lch(44.63, 52.67, 286.88°)
OKLab	oklab(52.79% -0.0149 -0.1442)
OKLCH	oklch(52.79% 0.145 264.1)
XYZ	xyz(16.0923, 14.2756, 50.6126)
Luminance	0.1428 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66BE #BE973F

analogous

#3FA6BE #3F66BE #583FBE

triadic

#3F66BE #BE3F66 #66BE3F

tetradic

#3F66BE #BE3FA6 #BE973F #3FBE58

square

#3F66BE #BE3FA6 #BE973F #3FBE58

split-complementary

#3F66BE #BE583F #A6BE3F

monochromatic

#213562 #304D90 #3F66BE #6C8ACE #9AAFDD

Accessibility & contrast

On white

5.45

#3F66BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.86

#3F66BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66BE

5.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66BE	#FFFFFF	#000000	##FFFFFF
##3F66BE	1.00	5.45	3.86	5.45
#FFFFFF	5.45	1.00	21.00	1.00
#000000	3.86	21.00	1.00	21.00
##FFFFFF	5.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A70C1

Deuteranopia (green-blind)

#2164BC

Tritanopia (blue-blind)

#007A89

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3f66be;
/* rgb */ color: rgb(63, 102, 190);
/* oklch */ color: oklch(52.8% 0.145 264.1);

Tailwind

colors: {
  custom: {
    50: '#8291d2',
    500: '#3f66be',
    950: '#000000',
  },
}

SCSS

$custom: #3f66be;
$custom-light: #8291d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66be",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 190
  },
  "hsl": {
    "h": 221.575,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.52786,
    "c": 0.14499,
    "h": 264.1
  },
  "luminance": 0.14277
}

Semantic roles & 50–950 ramp

primary

#3F66BE

secondary

#C9B88F

accent

#AF4EDA

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0C0C14

muted

#7D7D82

Preview Lab

Preview with #3F66BE

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

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