#233F9B#233F9B

#233F9B is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.6% C 0.154 H 266.5°. Best body text is #FFFFFF at 9.31:1 contrast (WCAG AA passes).

Color values

HEX	#233F9B
RGB	rgb(35, 63, 155)
HSL	hsl(226, 63%, 37%)
HSV	hsv(226, 77%, 61%)
CMYK	cmyk(77.4%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(30.10, 23.86, -53.17)
CIE-LCH	lch(30.10, 58.28, 294.17°)
OKLab	oklab(40.64% -0.0094 -0.1535)
OKLCH	oklch(40.64% 0.154 266.5)
XYZ	xyz(8.3850, 6.2780, 31.7738)
Luminance	0.0628 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#233F9B #9B7F23

analogous

#237B9B #233F9B #43239B

triadic

#233F9B #9B233F #3F9B23

tetradic

#233F9B #9B237B #9B7F23 #239B43

square

#233F9B #9B237B #9B7F23 #239B43

split-complementary

#233F9B #9B4323 #7B9B23

monochromatic

#0C1637 #182B69 #233F9B #2E53CD #5E7BDB

Accessibility & contrast

On white

9.31

#233F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#233F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #233F9B

9.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##233F9B	#FFFFFF	#000000	##FFFFFF
##233F9B	1.00	9.31	2.26	9.31
#FFFFFF	9.31	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9E

Deuteranopia (green-blind)

#004299

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #233f9b;
/* rgb */ color: rgb(35, 63, 155);
/* oklch */ color: oklch(40.6% 0.154 266.5);

Tailwind

colors: {
  custom: {
    50: '#7173b9',
    500: '#233f9b',
    950: '#000000',
  },
}

SCSS

$custom: #233f9b;
$custom-light: #7173b9;
$custom-dark: #000000;

JSON

{
  "hex": "#233f9b",
  "rgb": {
    "r": 35,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 226,
    "s": 63.158,
    "l": 37.255
  },
  "oklch": {
    "l": 0.40637,
    "c": 0.15381,
    "h": 266.5
  },
  "luminance": 0.06279
}

Semantic roles & 50–950 ramp

primary

#233F9B

secondary

#BFA85A

accent

#C042E6

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #233F9B

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

Preview Lab → · Contrast checker → · Palette generator →