#1C3F9B#1C3F9B

#1C3F9B is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.4% C 0.156 H 264.5°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#1C3F9B
RGB	rgb(28, 63, 155)
HSL	hsl(223, 69%, 36%)
HSV	hsv(223, 82%, 61%)
CMYK	cmyk(81.9%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(29.83, 23.12, -53.62)
CIE-LCH	lch(29.83, 58.40, 293.32°)
OKLab	oklab(40.36% -0.0149 -0.155)
OKLCH	oklch(40.36% 0.156 264.5)
XYZ	xyz(8.1707, 6.1675, 31.7638)
Luminance	0.0617 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1C3F9B #9B781C

analogous

#1C7E9B #1C3F9B #391C9B

triadic

#1C3F9B #9B1C3F #3F9B1C

tetradic

#1C3F9B #9B1C7E #9B781C #1C9B39

square

#1C3F9B #9B1C7E #9B781C #1C9B39

split-complementary

#1C3F9B #9B391C #7E9B1C

monochromatic

#091533 #132A67 #1C3F9B #2554CF #5279E0

Accessibility & contrast

On white

9.40

#1C3F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1C3F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1C3F9B

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1C3F9B	#FFFFFF	#000000	##FFFFFF
##1C3F9B	1.00	9.40	2.23	9.40
#FFFFFF	9.40	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9E

Deuteranopia (green-blind)

#004199

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1c3f9b;
/* rgb */ color: rgb(28, 63, 155);
/* oklch */ color: oklch(40.4% 0.156 264.5);

Tailwind

colors: {
  custom: {
    50: '#6f73b9',
    500: '#1c3f9b',
    950: '#000000',
  },
}

SCSS

$custom: #1c3f9b;
$custom-light: #6f73b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1c3f9b",
  "rgb": {
    "r": 28,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 223.465,
    "s": 69.399,
    "l": 35.882
  },
  "oklch": {
    "l": 0.40357,
    "c": 0.1557,
    "h": 264.5
  },
  "luminance": 0.06168
}

Semantic roles & 50–950 ramp

primary

#1C3F9B

secondary

#C3A350

accent

#BC3CEC

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1C3F9B

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

Preview Lab → · Contrast checker → · Palette generator →