#3F45B4#3F45B4

#3F45B4 is a mid, vivid blue. Relative luminance 0.086; OKLCH L 45.5% C 0.173 H 274.8°. Best body text is #FFFFFF at 7.72:1 contrast (WCAG AA passes).

Color values

HEX	#3F45B4
RGB	rgb(63, 69, 180)
HSL	hsl(237, 48%, 48%)
HSV	hsv(237, 65%, 71%)
CMYK	cmyk(65%, 61.7%, 0%, 29.4%)
CIE-LAB	lab(35.22, 32.92, -59.76)
CIE-LCH	lch(35.22, 68.23, 298.85°)
OKLab	oklab(45.48% 0.0145 -0.1722)
OKLCH	oklch(45.48% 0.173 274.8)
XYZ	xyz(12.4135, 8.6072, 44.1784)
Luminance	0.0861 (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

#3F45B4 #B4AE3F

analogous

#3F7FB4 #3F45B4 #733FB4

triadic

#3F45B4 #B43F45 #45B43F

tetradic

#3F45B4 #B43F7F #B4AE3F #3FB473

square

#3F45B4 #B43F7F #B4AE3F #3FB473

split-complementary

#3F45B4 #B4733F #7FB43F

monochromatic

#1F2259 #2F3487 #3F45B4 #676CCA #9497DA

Accessibility & contrast

On white

7.72

#3F45B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.72

#3F45B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45B4

7.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45B4	#FFFFFF	#000000	##FFFFFF
##3F45B4	1.00	7.72	2.72	7.72
#FFFFFF	7.72	1.00	21.00	1.00
#000000	2.72	21.00	1.00	21.00
##FFFFFF	7.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058B8

Deuteranopia (green-blind)

#004EB2

Tritanopia (blue-blind)

#006176

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #3f45b4;
/* rgb */ color: rgb(63, 69, 180);
/* oklch */ color: oklch(45.5% 0.173 274.8);

Tailwind

colors: {
  custom: {
    50: '#8279cb',
    500: '#3f45b4',
    950: '#000000',
  },
}

SCSS

$custom: #3f45b4;
$custom-light: #8279cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45b4",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 180
  },
  "hsl": {
    "h": 236.923,
    "s": 48.148,
    "l": 47.647
  },
  "oklch": {
    "l": 0.45479,
    "c": 0.17277,
    "h": 274.8
  },
  "luminance": 0.08608
}

Semantic roles & 50–950 ramp

primary

#3F45B4

secondary

#C5C28A

accent

#D150D8

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0913

muted

#7D7B82

Preview Lab

Preview with #3F45B4

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

Preview Lab → · Contrast checker → · Palette generator →