#1F4B9F#1F4B9F

#1F4B9F is a dark, vivid blue. Relative luminance 0.078; OKLCH L 43.3% C 0.145 H 261.7°. Best body text is #FFFFFF at 8.19:1 contrast (WCAG AA passes).

Color values

HEX	#1F4B9F
RGB	rgb(31, 75, 159)
HSL	hsl(219, 67%, 37%)
HSV	hsv(219, 81%, 62%)
CMYK	cmyk(80.5%, 52.8%, 0%, 37.6%)
CIE-LAB	lab(33.62, 16.84, -49.89)
CIE-LCH	lch(33.62, 52.66, 288.65°)
OKLab	oklab(43.35% -0.021 -0.1437)
OKLCH	oklch(43.35% 0.145 261.7)
XYZ	xyz(9.3369, 7.8256, 33.8126)
Luminance	0.0783 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4B9F #9F731F

analogous

#1F8B9F #1F4B9F #331F9F

triadic

#1F4B9F #9F1F4B #4B9F1F

tetradic

#1F4B9F #9F1F8B #9F731F #1F9F33

square

#1F4B9F #9F1F8B #9F731F #1F9F33

split-complementary

#1F4B9F #9F331F #8B9F1F

monochromatic

#0B1B39 #15336C #1F4B9F #2963D2 #5A87DF

Accessibility & contrast

On white

8.19

#1F4B9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.57

#1F4B9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4B9F

8.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4B9F	#FFFFFF	#000000	##FFFFFF
##1F4B9F	1.00	8.19	2.57	8.19
#FFFFFF	8.19	1.00	21.00	1.00
#000000	2.57	21.00	1.00	21.00
##FFFFFF	8.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1055A2

Deuteranopia (green-blind)

#004A9D

Tritanopia (blue-blind)

#005F6D

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #1f4b9f;
/* rgb */ color: rgb(31, 75, 159);
/* oklch */ color: oklch(43.3% 0.145 261.7);

Tailwind

colors: {
  custom: {
    50: '#707cbc',
    500: '#1f4b9f',
    950: '#000000',
  },
}

SCSS

$custom: #1f4b9f;
$custom-light: #707cbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4b9f",
  "rgb": {
    "r": 31,
    "g": 75,
    "b": 159
  },
  "hsl": {
    "h": 219.375,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.43346,
    "c": 0.14526,
    "h": 261.7
  },
  "luminance": 0.07827
}

Semantic roles & 50–950 ramp

primary

#1F4B9F

secondary

#C39E57

accent

#AF3EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090912

muted

#7B7B81

Preview Lab

Preview with #1F4B9F

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

Preview Lab → · Contrast checker → · Palette generator →