#1B388F#1B388F

#1B388F is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.8% C 0.148 H 265.5°. Best body text is #FFFFFF at 10.45:1 contrast (WCAG AA passes).

Color values

HEX	#1B388F
RGB	rgb(27, 56, 143)
HSL	hsl(225, 68%, 33%)
HSV	hsv(225, 81%, 56%)
CMYK	cmyk(81.1%, 60.8%, 0%, 43.9%)
CIE-LAB	lab(26.86, 23.06, -51.12)
CIE-LCH	lch(26.86, 56.08, 294.28°)
OKLab	oklab(37.81% -0.0116 -0.1478)
OKLCH	oklch(37.81% 0.148 265.5)
XYZ	xyz(6.8223, 5.0437, 26.5952)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B388F #8F721B

analogous

#1B728F #1B388F #381B8F

triadic

#1B388F #8F1B38 #388F1B

tetradic

#1B388F #8F1B72 #8F721B #1B8F38

square

#1B388F #8F1B72 #8F721B #1B8F38

split-complementary

#1B388F #8F381B #728F1B

monochromatic

#081028 #11245C #1B388F #254CC2 #486DDC

Accessibility & contrast

On white

10.45

#1B388F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1B388F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B388F

10.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B388F	#FFFFFF	#000000	##FFFFFF
##1B388F	1.00	10.45	2.01	10.45
#FFFFFF	10.45	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004592

Deuteranopia (green-blind)

#003A8D

Tritanopia (blue-blind)

#004E5E

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b388f;
/* rgb */ color: rgb(27, 56, 143);
/* oklch */ color: oklch(37.8% 0.148 265.5);

Tailwind

colors: {
  custom: {
    50: '#6c6eb1',
    500: '#1b388f',
    950: '#000000',
  },
}

SCSS

$custom: #1b388f;
$custom-light: #6c6eb1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b388f",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 143
  },
  "hsl": {
    "h": 225,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.37807,
    "c": 0.14822,
    "h": 265.5
  },
  "luminance": 0.05045
}

Semantic roles & 50–950 ramp

primary

#1B388F

secondary

#BEA148

accent

#BF3DEB

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B388F

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

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