#3F45D9#3F45D9

#3F45D9 is a mid, highly saturated blue. Relative luminance 0.103; OKLCH L 48.8% C 0.220 H 273.0°. Best body text is #FFFFFF at 6.85:1 contrast (WCAG AA passes).

Color values

HEX	#3F45D9
RGB	rgb(63, 69, 217)
HSL	hsl(238, 67%, 55%)
HSV	hsv(238, 71%, 85%)
CMYK	cmyk(71%, 68.2%, 0%, 14.9%)
CIE-LAB	lab(38.41, 45.50, -76.08)
CIE-LCH	lch(38.41, 88.65, 300.88°)
OKLab	oklab(48.79% 0.0114 -0.22)
OKLCH	oklch(48.79% 0.22 273)
XYZ	xyz(16.6982, 10.3211, 66.7443)
Luminance	0.1032 (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

#3F45D9 #D9D33F

analogous

#3F92D9 #3F45D9 #863FD9

triadic

#3F45D9 #D93F45 #45D93F

tetradic

#3F45D9 #D93F92 #D9D33F #3FD986

square

#3F45D9 #D93F92 #D9D33F #3FD986

split-complementary

#3F45D9 #D9863F #92D93F

monochromatic

#1A1E84 #242AB7 #3F45D9 #7276E3 #A5A8ED

Accessibility & contrast

On white

6.85

#3F45D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.06

#3F45D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F45D9

6.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45D9	#FFFFFF	#000000	##FFFFFF
##3F45D9	1.00	6.85	3.06	6.85
#FFFFFF	6.85	1.00	21.00	1.00
#000000	3.06	21.00	1.00	21.00
##FFFFFF	6.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0062DE

Deuteranopia (green-blind)

#0053D6

Tritanopia (blue-blind)

#006D8A

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3f45d9;
/* rgb */ color: rgb(63, 69, 217);
/* oklch */ color: oklch(48.8% 0.220 273.0);

Tailwind

colors: {
  custom: {
    50: '#8979e6',
    500: '#3f45d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f45d9;
$custom-light: #8979e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45d9",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 217
  },
  "hsl": {
    "h": 237.662,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.48791,
    "c": 0.22028,
    "h": 273
  },
  "luminance": 0.10323
}

Semantic roles & 50–950 ramp

primary

#3F45D9

secondary

#DAD89A

accent

#E33EEA

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0D0916

muted

#7E7B84

Preview Lab

Preview with #3F45D9

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

Preview Lab → · Contrast checker → · Palette generator →