#3F65CB#3F65CB

#3F65CB is a mid, vivid blue. Relative luminance 0.147; OKLCH L 53.5% C 0.164 H 265.7°. Best body text is #FFFFFF at 5.34:1 contrast (WCAG AA passes).

Color values

HEX	#3F65CB
RGB	rgb(63, 101, 203)
HSL	hsl(224, 57%, 52%)
HSV	hsv(224, 69%, 80%)
CMYK	cmyk(69%, 50.2%, 0%, 20.4%)
CIE-LAB	lab(45.18, 20.61, -57.01)
CIE-LCH	lch(45.18, 60.62, 289.88°)
OKLab	oklab(53.48% -0.0122 -0.1637)
OKLCH	oklch(53.48% 0.164 265.7)
XYZ	xyz(17.4793, 14.6742, 58.3996)
Luminance	0.1468 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F65CB #CBA53F

analogous

#3FABCB #3F65CB #5F3FCB

triadic

#3F65CB #CB3F65 #65CB3F

tetradic

#3F65CB #CB3FAB #CBA53F #3FCB5F

square

#3F65CB #CB3FAB #CBA53F #3FCB5F

split-complementary

#3F65CB #CB5F3F #ABCB3F

monochromatic

#1F3571 #2C4CA1 #3F65CB #6F8CD8 #9FB2E5

Accessibility & contrast

On white

5.34

#3F65CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.94

#3F65CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F65CB

5.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F65CB	#FFFFFF	#000000	##FFFFFF
##3F65CB	1.00	5.34	3.94	5.34
#FFFFFF	5.34	1.00	21.00	1.00
#000000	3.94	21.00	1.00	21.00
##FFFFFF	5.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2972CF

Deuteranopia (green-blind)

#0065C9

Tritanopia (blue-blind)

#007D8E

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #3f65cb;
/* rgb */ color: rgb(63, 101, 203);
/* oklch */ color: oklch(53.5% 0.164 265.7);

Tailwind

colors: {
  custom: {
    50: '#8490db',
    500: '#3f65cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f65cb;
$custom-light: #8490db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f65cb",
  "rgb": {
    "r": 63,
    "g": 101,
    "b": 203
  },
  "hsl": {
    "h": 223.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.5348,
    "c": 0.16413,
    "h": 265.7
  },
  "luminance": 0.14676
}

Semantic roles & 50–950 ramp

primary

#3F65CB

secondary

#D1C194

accent

#B747E1

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F65CB

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

Preview Lab → · Contrast checker → · Palette generator →