#1B338F#1B338F

#1B338F is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.8% C 0.155 H 266.9°. Best body text is #FFFFFF at 10.96:1 contrast (WCAG AA passes).

Color values

HEX	#1B338F
RGB	rgb(27, 51, 143)
HSL	hsl(228, 68%, 33%)
HSV	hsv(228, 81%, 56%)
CMYK	cmyk(81.1%, 64.3%, 0%, 43.9%)
CIE-LAB	lab(25.51, 26.50, -53.33)
CIE-LCH	lch(25.51, 59.55, 296.42°)
OKLab	oklab(36.81% -0.0084 -0.1543)
OKLCH	oklch(36.81% 0.155 266.9)
XYZ	xyz(6.5920, 4.5831, 26.5185)
Luminance	0.0458 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B338F #8F771B

analogous

#1B6D8F #1B338F #3D1B8F

triadic

#1B338F #8F1B33 #338F1B

tetradic

#1B338F #8F1B6D #8F771B #1B8F3D

square

#1B338F #8F1B6D #8F771B #1B8F3D

split-complementary

#1B338F #8F3D1B #6D8F1B

monochromatic

#080E28 #11215C #1B338F #2545C2 #4867DC

Accessibility & contrast

On white

10.96

#1B338F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1B338F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B338F

10.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B338F	#FFFFFF	#000000	##FFFFFF
##1B338F	1.00	10.96	1.92	10.96
#FFFFFF	10.96	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004292

Deuteranopia (green-blind)

#00378D

Tritanopia (blue-blind)

#004B5C

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b338f;
/* rgb */ color: rgb(27, 51, 143);
/* oklch */ color: oklch(36.8% 0.155 266.9);

Tailwind

colors: {
  custom: {
    50: '#6c6ab1',
    500: '#1b338f',
    950: '#000000',
  },
}

SCSS

$custom: #1b338f;
$custom-light: #6c6ab1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b338f",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 143
  },
  "hsl": {
    "h": 227.586,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.36806,
    "c": 0.15452,
    "h": 266.9
  },
  "luminance": 0.04584
}

Semantic roles & 50–950 ramp

primary

#1B338F

secondary

#BEA648

accent

#C73DEB

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080611

muted

#7B7A80

Preview Lab

Preview with #1B338F

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

Preview Lab → · Contrast checker → · Palette generator →