#1F377B#1F377B

#1F377B is a dark, moderate blue. Relative luminance 0.045; OKLCH L 36.0% C 0.120 H 265.9°. Best body text is #FFFFFF at 11.11:1 contrast (WCAG AA passes).

Color values

HEX	#1F377B
RGB	rgb(31, 55, 123)
HSL	hsl(224, 60%, 30%)
HSV	hsv(224, 75%, 48%)
CMYK	cmyk(74.8%, 55.3%, 0%, 51.8%)
CIE-LAB	lab(25.12, 16.23, -41.47)
CIE-LCH	lch(25.12, 44.53, 291.38°)
OKLab	oklab(36.03% -0.0085 -0.1193)
OKLCH	oklch(36.03% 0.12 265.9)
XYZ	xyz(5.5052, 4.4532, 19.3045)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F377B #7B631F

analogous

#1F657B #1F377B #351F7B

triadic

#1F377B #7B1F37 #377B1F

tetradic

#1F377B #7B1F65 #7B631F #1F7B35

square

#1F377B #7B1F65 #7B631F #1F7B35

split-complementary

#1F377B #7B351F #657B1F

monochromatic

#060B19 #13214A #1F377B #2B4DAC #4469D0

Accessibility & contrast

On white

11.11

#1F377B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1F377B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F377B

11.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F377B	#FFFFFF	#000000	##FFFFFF
##1F377B	1.00	11.11	1.89	11.11
#FFFFFF	11.11	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#06407D

Deuteranopia (green-blind)

#00387A

Tritanopia (blue-blind)

#004753

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1f377b;
/* rgb */ color: rgb(31, 55, 123);
/* oklch */ color: oklch(36.0% 0.120 265.9);

Tailwind

colors: {
  custom: {
    50: '#686da2',
    500: '#1f377b',
    950: '#000000',
  },
}

SCSS

$custom: #1f377b;
$custom-light: #686da2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f377b",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 123
  },
  "hsl": {
    "h": 224.348,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.36033,
    "c": 0.11963,
    "h": 265.9
  },
  "luminance": 0.04454
}

Semantic roles & 50–950 ramp

primary

#1F377B

secondary

#AE9348

accent

#BA45E3

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1F377B

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

Preview Lab → · Contrast checker → · Palette generator →