#3B66CB#3B66CB

#3B66CB is a mid, vivid blue. Relative luminance 0.147; OKLCH L 53.5% C 0.164 H 264.2°. Best body text is #FFFFFF at 5.32:1 contrast (WCAG AA passes).

Color values

HEX	#3B66CB
RGB	rgb(59, 102, 203)
HSL	hsl(222, 58%, 51%)
HSV	hsv(222, 71%, 80%)
CMYK	cmyk(70.9%, 49.8%, 0%, 20.4%)
CIE-LAB	lab(45.28, 19.39, -56.86)
CIE-LCH	lch(45.28, 60.08, 288.83°)
OKLab	oklab(53.5% -0.0165 -0.1633)
OKLCH	oklch(53.5% 0.164 264.2)
XYZ	xyz(17.3307, 14.7425, 58.4206)
Luminance	0.1474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3B66CB #CBA03B

analogous

#3BAECB #3B66CB #583BCB

triadic

#3B66CB #CB3B66 #66CB3B

tetradic

#3B66CB #CB3BAE #CBA03B #3BCB58

square

#3B66CB #CB3BAE #CBA03B #3BCB58

split-complementary

#3B66CB #CB583B #AECB3B

monochromatic

#1D356E #2A4D9F #3B66CB #6B8CD8 #9CB2E5

Accessibility & contrast

On white

5.32

#3B66CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.95

#3B66CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3B66CB

5.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3B66CB	#FFFFFF	#000000	##FFFFFF
##3B66CB	1.00	5.32	3.95	5.32
#FFFFFF	5.32	1.00	21.00	1.00
#000000	3.95	21.00	1.00	21.00
##FFFFFF	5.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B72CF

Deuteranopia (green-blind)

#0065C9

Tritanopia (blue-blind)

#007E8F

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #3b66cb;
/* rgb */ color: rgb(59, 102, 203);
/* oklch */ color: oklch(53.5% 0.164 264.2);

Tailwind

colors: {
  custom: {
    50: '#8291db',
    500: '#3b66cb',
    950: '#000000',
  },
}

SCSS

$custom: #3b66cb;
$custom-light: #8291db;
$custom-dark: #000000;

JSON

{
  "hex": "#3b66cb",
  "rgb": {
    "r": 59,
    "g": 102,
    "b": 203
  },
  "hsl": {
    "h": 222.083,
    "s": 58.065,
    "l": 51.373
  },
  "oklch": {
    "l": 0.53503,
    "c": 0.16413,
    "h": 264.2
  },
  "luminance": 0.14744
}

Semantic roles & 50–950 ramp

primary

#3B66CB

secondary

#D1BE91

accent

#B347E1

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3B66CB

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

Preview Lab → · Contrast checker → · Palette generator →