#343F9B#343F9B

#343F9B is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.5% C 0.149 H 272.9°. Best body text is #FFFFFF at 9.01:1 contrast (WCAG AA passes).

Color values

HEX	#343F9B
RGB	rgb(52, 63, 155)
HSL	hsl(234, 50%, 41%)
HSV	hsv(234, 66%, 61%)
CMYK	cmyk(66.5%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(31.00, 26.23, -51.67)
CIE-LCH	lch(31.00, 57.95, 296.91°)
OKLab	oklab(41.55% 0.0076 -0.1487)
OKLCH	oklch(41.55% 0.149 272.9)
XYZ	xyz(9.1081, 6.6508, 31.8077)
Luminance	0.0665 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#343F9B #9B9034

analogous

#34729B #343F9B #5C349B

triadic

#343F9B #9B343F #3F9B34

tetradic

#343F9B #9B3472 #9B9034 #349B5C

square

#343F9B #9B3472 #9B9034 #349B5C

split-complementary

#343F9B #9B5C34 #729B34

monochromatic

#151A3F #252C6D #343F9B #4A57C2 #7881D2

Accessibility & contrast

On white

9.01

#343F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#343F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #343F9B

9.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##343F9B	#FFFFFF	#000000	##FFFFFF
##343F9B	1.00	9.01	2.33	9.01
#FFFFFF	9.01	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004E9E

Deuteranopia (green-blind)

#004499

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #343f9b;
/* rgb */ color: rgb(52, 63, 155);
/* oklch */ color: oklch(41.5% 0.149 272.9);

Tailwind

colors: {
  custom: {
    50: '#7874b9',
    500: '#343f9b',
    950: '#000000',
  },
}

SCSS

$custom: #343f9b;
$custom-light: #7874b9;
$custom-dark: #000000;

JSON

{
  "hex": "#343f9b",
  "rgb": {
    "r": 52,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 233.592,
    "s": 49.758,
    "l": 40.588
  },
  "oklch": {
    "l": 0.41547,
    "c": 0.14894,
    "h": 272.9
  },
  "luminance": 0.06652
}

Semantic roles & 50–950 ramp

primary

#343F9B

secondary

#BAB271

accent

#CA4FD9

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #343F9B

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

Preview Lab → · Contrast checker → · Palette generator →