#1F388B#1F388B

#1F388B is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.6% C 0.141 H 266.6°. Best body text is #FFFFFF at 10.52:1 contrast (WCAG AA passes).

Color values

HEX	#1F388B
RGB	rgb(31, 56, 139)
HSL	hsl(226, 64%, 33%)
HSV	hsv(226, 78%, 55%)
CMYK	cmyk(77.7%, 59.7%, 0%, 45.5%)
CIE-LAB	lab(26.69, 21.91, -48.93)
CIE-LCH	lch(26.69, 53.61, 294.13°)
OKLab	oklab(37.62% -0.0083 -0.1412)
OKLCH	oklch(37.62% 0.141 266.6)
XYZ	xyz(6.6378, 4.9830, 25.0331)
Luminance	0.0498 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F388B #8B721F

analogous

#1F6E8B #1F388B #3C1F8B

triadic

#1F388B #8B1F38 #388B1F

tetradic

#1F388B #8B1F6E #8B721F #1F8B3C

square

#1F388B #8B1F6E #8B721F #1F8B3C

split-complementary

#1F388B #8B3C1F #6E8B1F

monochromatic

#091027 #142459 #1F388B #2A4CBD #4D6DD7

Accessibility & contrast

On white

10.52

#1F388B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1F388B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F388B

10.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F388B	#FFFFFF	#000000	##FFFFFF
##1F388B	1.00	10.52	2.00	10.52
#FFFFFF	10.52	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448E

Deuteranopia (green-blind)

#003A89

Tritanopia (blue-blind)

#004D5C

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1f388b;
/* rgb */ color: rgb(31, 56, 139);
/* oklch */ color: oklch(37.6% 0.141 266.6);

Tailwind

colors: {
  custom: {
    50: '#6c6eae',
    500: '#1f388b',
    950: '#000000',
  },
}

SCSS

$custom: #1f388b;
$custom-light: #6c6eae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f388b",
  "rgb": {
    "r": 31,
    "g": 56,
    "b": 139
  },
  "hsl": {
    "h": 226.111,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.37619,
    "c": 0.14149,
    "h": 266.6
  },
  "luminance": 0.04984
}

Semantic roles & 50–950 ramp

primary

#1F388B

secondary

#BAA14C

accent

#C041E7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F388B

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

Preview Lab → · Contrast checker → · Palette generator →