#1F4F9F#1F4F9F

#1F4F9F is a dark, vivid blue. Relative luminance 0.084; OKLCH L 44.2% C 0.140 H 260.1°. Best body text is #FFFFFF at 7.84:1 contrast (WCAG AA passes).

Color values

HEX	#1F4F9F
RGB	rgb(31, 79, 159)
HSL	hsl(218, 67%, 37%)
HSV	hsv(218, 81%, 62%)
CMYK	cmyk(80.5%, 50.3%, 0%, 37.6%)
CIE-LAB	lab(34.77, 14.14, -48.02)
CIE-LCH	lch(34.77, 50.06, 286.41°)
OKLab	oklab(44.23% -0.0241 -0.1382)
OKLCH	oklch(44.23% 0.14 260.1)
XYZ	xyz(9.6168, 8.3853, 33.9059)
Luminance	0.0839 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4F9F #9F6F1F

analogous

#1F8F9F #1F4F9F #2F1F9F

triadic

#1F4F9F #9F1F4F #4F9F1F

tetradic

#1F4F9F #9F1F8F #9F6F1F #1F9F2F

square

#1F4F9F #9F1F8F #9F6F1F #1F9F2F

split-complementary

#1F4F9F #9F2F1F #8F9F1F

monochromatic

#0B1C39 #15366C #1F4F9F #2968D2 #5A8CDF

Accessibility & contrast

On white

7.84

#1F4F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#1F4F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4F9F

7.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4F9F	#FFFFFF	#000000	##FFFFFF
##1F4F9F	1.00	7.84	2.68	7.84
#FFFFFF	7.84	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F58A2

Deuteranopia (green-blind)

#004C9D

Tritanopia (blue-blind)

#00626F

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #1f4f9f;
/* rgb */ color: rgb(31, 79, 159);
/* oklch */ color: oklch(44.2% 0.140 260.1);

Tailwind

colors: {
  custom: {
    50: '#707fbc',
    500: '#1f4f9f',
    950: '#000000',
  },
}

SCSS

$custom: #1f4f9f;
$custom-light: #707fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4f9f",
  "rgb": {
    "r": 31,
    "g": 79,
    "b": 159
  },
  "hsl": {
    "h": 217.5,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.44229,
    "c": 0.14024,
    "h": 260.1
  },
  "luminance": 0.08386
}

Semantic roles & 50–950 ramp

primary

#1F4F9F

secondary

#C39A57

accent

#A93EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F4F9F

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

Preview Lab → · Contrast checker → · Palette generator →