#3F45CB#3F45CB

#3F45CB is a mid, highly saturated blue. Relative luminance 0.096; OKLCH L 47.5% C 0.203 H 273.7°. Best body text is #FFFFFF at 7.18:1 contrast (WCAG AA passes).

Color values

HEX	#3F45CB
RGB	rgb(63, 69, 203)
HSL	hsl(237, 57%, 52%)
HSV	hsv(237, 69%, 80%)
CMYK	cmyk(69%, 66%, 0%, 20.4%)
CIE-LAB	lab(37.16, 40.80, -70.06)
CIE-LCH	lch(37.16, 81.07, 300.21°)
OKLab	oklab(47.5% 0.0129 -0.2024)
OKLCH	oklch(47.5% 0.203 273.7)
XYZ	xyz(14.9539, 9.6234, 57.5578)
Luminance	0.0963 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F45CB #CBC53F

analogous

#3F8BCB #3F45CB #7F3FCB

triadic

#3F45CB #CB3F45 #45CB3F

tetradic

#3F45CB #CB3F8B #CBC53F #3FCB7F

square

#3F45CB #CB3F8B #CBC53F #3FCB7F

split-complementary

#3F45CB #CB7F3F #8BCB3F

monochromatic

#1F2271 #2C31A1 #3F45CB #6F74D8 #9FA2E5

Accessibility & contrast

On white

7.18

#3F45CB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.93

#3F45CB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45CB

7.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45CB	#FFFFFF	#000000	##FFFFFF
##3F45CB	1.00	7.18	2.93	7.18
#FFFFFF	7.18	1.00	21.00	1.00
#000000	2.93	21.00	1.00	21.00
##FFFFFF	7.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ECF

Deuteranopia (green-blind)

#0051C8

Tritanopia (blue-blind)

#006882

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f45cb;
/* rgb */ color: rgb(63, 69, 203);
/* oklch */ color: oklch(47.5% 0.203 273.7);

Tailwind

colors: {
  custom: {
    50: '#8679dc',
    500: '#3f45cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f45cb;
$custom-light: #8679dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45cb",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 203
  },
  "hsl": {
    "h": 237.429,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.47499,
    "c": 0.20278,
    "h": 273.7
  },
  "luminance": 0.09625
}

Semantic roles & 50–950 ramp

primary

#3F45CB

secondary

#D1CF94

accent

#DA47E1

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0915

muted

#7E7B83

Preview Lab

Preview with #3F45CB

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

Preview Lab → · Contrast checker → · Palette generator →