#3F5DCB#3F5DCB

#3F5DCB is a mid, vivid blue. Relative luminance 0.132; OKLCH L 51.9% C 0.174 H 268.2°. Best body text is #FFFFFF at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#3F5DCB
RGB	rgb(63, 93, 203)
HSL	hsl(227, 57%, 52%)
HSV	hsv(227, 69%, 80%)
CMYK	cmyk(69%, 54.2%, 0%, 20.4%)
CIE-LAB	lab(43.06, 25.72, -60.45)
CIE-LCH	lch(43.06, 65.69, 293.05°)
OKLab	oklab(51.87% -0.0054 -0.1739)
OKLCH	oklch(51.87% 0.174 268.2)
XYZ	xyz(16.7400, 13.1956, 58.1531)
Luminance	0.1320 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F5DCB #CBAD3F

analogous

#3FA3CB #3F5DCB #673FCB

triadic

#3F5DCB #CB3F5D #5DCB3F

tetradic

#3F5DCB #CB3FA3 #CBAD3F #3FCB67

square

#3F5DCB #CB3FA3 #CBAD3F #3FCB67

split-complementary

#3F5DCB #CB673F #A3CB3F

monochromatic

#1F3071 #2C45A1 #3F5DCB #6F86D8 #9FAEE5

Accessibility & contrast

On white

5.77

#3F5DCB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.64

#3F5DCB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F5DCB

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F5DCB	#FFFFFF	#000000	##FFFFFF
##3F5DCB	1.00	5.77	3.64	5.77
#FFFFFF	5.77	1.00	21.00	1.00
#000000	3.64	21.00	1.00	21.00
##FFFFFF	5.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#016CCF

Deuteranopia (green-blind)

#0060C9

Tritanopia (blue-blind)

#00778B

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3f5dcb;
/* rgb */ color: rgb(63, 93, 203);
/* oklch */ color: oklch(51.9% 0.174 268.2);

Tailwind

colors: {
  custom: {
    50: '#858adc',
    500: '#3f5dcb',
    950: '#000000',
  },
}

SCSS

$custom: #3f5dcb;
$custom-light: #858adc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f5dcb",
  "rgb": {
    "r": 63,
    "g": 93,
    "b": 203
  },
  "hsl": {
    "h": 227.143,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.51869,
    "c": 0.17399,
    "h": 268.2
  },
  "luminance": 0.13197
}

Semantic roles & 50–950 ramp

primary

#3F5DCB

secondary

#D1C494

accent

#C047E1

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F5DCB

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

Preview Lab → · Contrast checker → · Palette generator →