#3F45B9#3F45B9

#3F45B9 is a mid, vivid blue. Relative luminance 0.088; OKLCH L 45.9% C 0.179 H 274.6°. Best body text is #FFFFFF at 7.60:1 contrast (WCAG AA passes).

Color values

HEX	#3F45B9
RGB	rgb(63, 69, 185)
HSL	hsl(237, 49%, 49%)
HSV	hsv(237, 66%, 73%)
CMYK	cmyk(65.9%, 62.7%, 0%, 27.5%)
CIE-LAB	lab(35.63, 34.64, -62.04)
CIE-LCH	lch(35.63, 71.06, 299.18°)
OKLab	oklab(45.91% 0.0143 -0.1789)
OKLCH	oklch(45.91% 0.179 274.6)
XYZ	xyz(12.9321, 8.8147, 46.9094)
Luminance	0.0882 (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

#3F45B9 #B9B33F

analogous

#3F82B9 #3F45B9 #763FB9

triadic

#3F45B9 #B93F45 #45B93F

tetradic

#3F45B9 #B93F82 #B9B33F #3FB976

square

#3F45B9 #B93F82 #B9B33F #3FB976

split-complementary

#3F45B9 #B9763F #82B93F

monochromatic

#20235E #2F348B #3F45B9 #696ECC #979ADC

Accessibility & contrast

On white

7.60

#3F45B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.76

#3F45B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45B9

7.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45B9	#FFFFFF	#000000	##FFFFFF
##3F45B9	1.00	7.60	2.76	7.60
#FFFFFF	7.60	1.00	21.00	1.00
#000000	2.76	21.00	1.00	21.00
##FFFFFF	7.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059BD

Deuteranopia (green-blind)

#004EB7

Tritanopia (blue-blind)

#006278

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f45b9;
/* rgb */ color: rgb(63, 69, 185);
/* oklch */ color: oklch(45.9% 0.179 274.6);

Tailwind

colors: {
  custom: {
    50: '#8379cf',
    500: '#3f45b9',
    950: '#000000',
  },
}

SCSS

$custom: #3f45b9;
$custom-light: #8379cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45b9",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 185
  },
  "hsl": {
    "h": 237.049,
    "s": 49.194,
    "l": 48.627
  },
  "oklch": {
    "l": 0.45906,
    "c": 0.17944,
    "h": 274.6
  },
  "luminance": 0.08816
}

Semantic roles & 50–950 ramp

primary

#3F45B9

secondary

#C7C48D

accent

#D24FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #3F45B9

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

Preview Lab → · Contrast checker → · Palette generator →