#1F509B#1F509B

#1F509B is a dark, vivid blue. Relative luminance 0.084; OKLCH L 44.2% C 0.133 H 259.0°. Best body text is #FFFFFF at 7.84:1 contrast (WCAG AA passes).

Color values

HEX	#1F509B
RGB	rgb(31, 80, 155)
HSL	hsl(216, 67%, 36%)
HSV	hsv(216, 80%, 61%)
CMYK	cmyk(80%, 48.4%, 0%, 39.2%)
CIE-LAB	lab(34.79, 11.87, -45.58)
CIE-LCH	lch(34.79, 47.10, 284.60°)
OKLab	oklab(44.15% -0.0255 -0.131)
OKLCH	oklch(44.15% 0.133 259)
XYZ	xyz(9.3480, 8.3941, 32.1315)
Luminance	0.0839 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F509B #9B6A1F

analogous

#1F8E9B #1F509B #2C1F9B

triadic

#1F509B #9B1F50 #509B1F

tetradic

#1F509B #9B1F8E #9B6A1F #1F9B2C

square

#1F509B #9B1F8E #9B6A1F #1F9B2C

split-complementary

#1F509B #9B2C1F #8E9B1F

monochromatic

#0B1B35 #153668 #1F509B #296ACE #578CDD

Accessibility & contrast

On white

7.84

#1F509B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#1F509B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F509B

7.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F509B	#FFFFFF	#000000	##FFFFFF
##1F509B	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)

#26589E

Deuteranopia (green-blind)

#004D9A

Tritanopia (blue-blind)

#00626E

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #1f509b;
/* rgb */ color: rgb(31, 80, 155);
/* oklch */ color: oklch(44.2% 0.133 259.0);

Tailwind

colors: {
  custom: {
    50: '#6f80b9',
    500: '#1f509b',
    950: '#000000',
  },
}

SCSS

$custom: #1f509b;
$custom-light: #6f80b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f509b",
  "rgb": {
    "r": 31,
    "g": 80,
    "b": 155
  },
  "hsl": {
    "h": 216.29,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.44154,
    "c": 0.13342,
    "h": 259
  },
  "luminance": 0.08395
}

Semantic roles & 50–950 ramp

primary

#1F509B

secondary

#C19655

accent

#A63EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#080A11

muted

#7B7C80

Preview Lab

Preview with #1F509B

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

Preview Lab → · Contrast checker → · Palette generator →