#3F45B2#3F45B2

#3F45B2 is a mid, vivid blue. Relative luminance 0.085; OKLCH L 45.3% C 0.170 H 274.9°. Best body text is #FFFFFF at 7.76:1 contrast (WCAG AA passes).

Color values

HEX	#3F45B2
RGB	rgb(63, 69, 178)
HSL	hsl(237, 48%, 47%)
HSV	hsv(237, 65%, 70%)
CMYK	cmyk(64.6%, 61.2%, 0%, 30.2%)
CIE-LAB	lab(35.06, 32.23, -58.84)
CIE-LCH	lch(35.06, 67.08, 298.71°)
OKLab	oklab(45.31% 0.0146 -0.1694)
OKLCH	oklch(45.31% 0.17 274.9)
XYZ	xyz(12.2113, 8.5263, 43.1131)
Luminance	0.0853 (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

#3F45B2 #B2AC3F

analogous

#3F7EB2 #3F45B2 #733FB2

triadic

#3F45B2 #B23F45 #45B23F

tetradic

#3F45B2 #B23F7E #B2AC3F #3FB273

square

#3F45B2 #B23F7E #B2AC3F #3FB273

split-complementary

#3F45B2 #B2733F #7EB23F

monochromatic

#1F2258 #2F3385 #3F45B2 #666BC9 #9396D9

Accessibility & contrast

On white

7.76

#3F45B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#3F45B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45B2

7.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45B2	#FFFFFF	#000000	##FFFFFF
##3F45B2	1.00	7.76	2.71	7.76
#FFFFFF	7.76	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058B6

Deuteranopia (green-blind)

#004DB0

Tritanopia (blue-blind)

#006075

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3f45b2;
/* rgb */ color: rgb(63, 69, 178);
/* oklch */ color: oklch(45.3% 0.170 274.9);

Tailwind

colors: {
  custom: {
    50: '#8178ca',
    500: '#3f45b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f45b2;
$custom-light: #8178ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45b2",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 178
  },
  "hsl": {
    "h": 236.87,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.4531,
    "c": 0.17007,
    "h": 274.9
  },
  "luminance": 0.08527
}

Semantic roles & 50–950 ramp

primary

#3F45B2

secondary

#C4C189

accent

#D050D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #3F45B2

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

Preview Lab → · Contrast checker → · Palette generator →