#303FBB#303FBB

#303FBB is a dark, vivid blue. Relative luminance 0.078; OKLCH L 44.2% C 0.193 H 270.6°. Best body text is #FFFFFF at 8.22:1 contrast (WCAG AA passes).

Color values

HEX	#303FBB
RGB	rgb(48, 63, 187)
HSL	hsl(234, 59%, 46%)
HSV	hsv(234, 74%, 73%)
CMYK	cmyk(74.3%, 66.3%, 0%, 26.7%)
CIE-LAB	lab(33.50, 37.22, -66.74)
CIE-LCH	lch(33.50, 76.41, 299.15°)
OKLab	oklab(44.17% 0.002 -0.193)
OKLCH	oklch(44.17% 0.193 270.6)
XYZ	xyz(11.9630, 7.7700, 47.8734)
Luminance	0.0777 (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

#303FBB #BBAC30

analogous

#3084BB #303FBB #6630BB

triadic

#303FBB #BB303F #3FBB30

tetradic

#303FBB #BB3084 #BBAC30 #30BB66

square

#303FBB #BB3084 #BBAC30 #30BB66

split-complementary

#303FBB #BB6630 #84BB30

monochromatic

#171E5A #232F8A #303FBB #5563D3 #868FE0

Accessibility & contrast

On white

8.22

#303FBB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#303FBB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303FBB

8.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303FBB	#FFFFFF	#000000	##FFFFFF
##303FBB	1.00	8.22	2.55	8.22
#FFFFFF	8.22	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055BF

Deuteranopia (green-blind)

#0048B9

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #303fbb;
/* rgb */ color: rgb(48, 63, 187);
/* oklch */ color: oklch(44.2% 0.193 270.6);

Tailwind

colors: {
  custom: {
    50: '#7d74d1',
    500: '#303fbb',
    950: '#000000',
  },
}

SCSS

$custom: #303fbb;
$custom-light: #7d74d1;
$custom-dark: #000000;

JSON

{
  "hex": "#303fbb",
  "rgb": {
    "r": 48,
    "g": 63,
    "b": 187
  },
  "hsl": {
    "h": 233.525,
    "s": 59.149,
    "l": 46.078
  },
  "oklch": {
    "l": 0.44171,
    "c": 0.19303,
    "h": 270.6
  },
  "luminance": 0.07771
}

Semantic roles & 50–950 ramp

primary

#303FBB

secondary

#C9C17D

accent

#D145E2

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0B0814

muted

#7C7B82

Preview Lab

Preview with #303FBB

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

Preview Lab → · Contrast checker → · Palette generator →