#1F309F#1F309F

#1F309F is a dark, vivid blue. Relative luminance 0.049; OKLCH L 38.0% C 0.178 H 268.7°. Best body text is #FFFFFF at 10.60:1 contrast (WCAG AA passes).

Color values

HEX	#1F309F
RGB	rgb(31, 48, 159)
HSL	hsl(232, 67%, 37%)
HSV	hsv(232, 81%, 62%)
CMYK	cmyk(80.5%, 69.8%, 0%, 37.6%)
CIE-LAB	lab(26.47, 34.94, -61.56)
CIE-LCH	lch(26.47, 70.79, 299.58°)
OKLab	oklab(38.02% -0.0042 -0.1783)
OKLCH	oklch(38.02% 0.178 268.7)
XYZ	xyz(7.8779, 4.9075, 33.3262)
Luminance	0.0491 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F309F #9F8E1F

analogous

#1F709F #1F309F #4E1F9F

triadic

#1F309F #9F1F30 #309F1F

tetradic

#1F309F #9F1F70 #9F8E1F #1F9F4E

square

#1F309F #9F1F70 #9F8E1F #1F9F4E

split-complementary

#1F309F #9F4E1F #709F1F

monochromatic

#0B1139 #15216C #1F309F #293FD2 #5A6BDF

Accessibility & contrast

On white

10.60

#1F309F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1F309F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F309F

10.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F309F	#FFFFFF	#000000	##FFFFFF
##1F309F	1.00	10.60	1.98	10.60
#FFFFFF	10.60	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0045A2

Deuteranopia (green-blind)

#00389D

Tritanopia (blue-blind)

#004F63

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1f309f;
/* rgb */ color: rgb(31, 48, 159);
/* oklch */ color: oklch(38.0% 0.178 268.7);

Tailwind

colors: {
  custom: {
    50: '#7268bc',
    500: '#1f309f',
    950: '#000000',
  },
}

SCSS

$custom: #1f309f;
$custom-light: #7268bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f309f",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 159
  },
  "hsl": {
    "h": 232.031,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.38022,
    "c": 0.17835,
    "h": 268.7
  },
  "luminance": 0.04908
}

Semantic roles & 50–950 ramp

primary

#1F309F

secondary

#C3B457

accent

#D33EEA

background

#F7F6FB

surface

#EEEBF7

border

#C9C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1F309F

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

Preview Lab → · Contrast checker → · Palette generator →