#3F5ECB#3F5ECB

#3F5ECB is a mid, vivid blue. Relative luminance 0.134; OKLCH L 52.1% C 0.173 H 267.9°. Best body text is #FFFFFF at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#3F5ECB
RGB	rgb(63, 94, 203)
HSL	hsl(227, 57%, 52%)
HSV	hsv(227, 69%, 80%)
CMYK	cmyk(69%, 53.7%, 0%, 20.4%)
CIE-LAB	lab(43.32, 25.08, -60.02)
CIE-LCH	lch(43.32, 65.05, 292.67°)
OKLab	oklab(52.07% -0.0062 -0.1726)
OKLCH	oklch(52.07% 0.173 267.9)
XYZ	xyz(16.8284, 13.3723, 58.1826)
Luminance	0.1337 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F5ECB #CBAC3F

analogous

#3FA4CB #3F5ECB #663FCB

triadic

#3F5ECB #CB3F5E #5ECB3F

tetradic

#3F5ECB #CB3FA4 #CBAC3F #3FCB66

square

#3F5ECB #CB3FA4 #CBAC3F #3FCB66

split-complementary

#3F5ECB #CB663F #A4CB3F

monochromatic

#1F3171 #2C46A1 #3F5ECB #6F86D8 #9FAFE5

Accessibility & contrast

On white

5.71

#3F5ECB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.67

#3F5ECB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F5ECB

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F5ECB	#FFFFFF	#000000	##FFFFFF
##3F5ECB	1.00	5.71	3.67	5.71
#FFFFFF	5.71	1.00	21.00	1.00
#000000	3.67	21.00	1.00	21.00
##FFFFFF	5.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A6DCF

Deuteranopia (green-blind)

#0060C9

Tritanopia (blue-blind)

#00788B

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3f5ecb;
/* rgb */ color: rgb(63, 94, 203);
/* oklch */ color: oklch(52.1% 0.173 267.9);

Tailwind

colors: {
  custom: {
    50: '#848bdc',
    500: '#3f5ecb',
    950: '#000000',
  },
}

SCSS

$custom: #3f5ecb;
$custom-light: #848bdc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f5ecb",
  "rgb": {
    "r": 63,
    "g": 94,
    "b": 203
  },
  "hsl": {
    "h": 226.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.52067,
    "c": 0.17275,
    "h": 267.9
  },
  "luminance": 0.13374
}

Semantic roles & 50–950 ramp

primary

#3F5ECB

secondary

#D1C494

accent

#BF47E1

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F5ECB

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

Preview Lab → · Contrast checker → · Palette generator →