#101F5B#101F5B

#101F5B is a dark, moderate blue. Relative luminance 0.018; OKLCH L 27.1% C 0.109 H 267.5°. Best body text is #FFFFFF at 15.34:1 contrast (WCAG AA passes).

Color values

HEX	#101F5B
RGB	rgb(16, 31, 91)
HSL	hsl(228, 70%, 21%)
HSV	hsv(228, 82%, 36%)
CMYK	cmyk(82.4%, 65.9%, 0%, 64.3%)
CIE-LAB	lab(14.65, 18.36, -37.73)
CIE-LCH	lch(14.65, 41.96, 295.95°)
OKLab	oklab(27.13% -0.0047 -0.1091)
OKLCH	oklch(27.13% 0.109 267.5)
XYZ	xyz(2.5913, 1.8452, 10.1151)
Luminance	0.0185 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#101F5B #5B4C10

analogous

#10445B #101F5B #26105B

triadic

#101F5B #5B101F #1F5B10

tetradic

#101F5B #5B1044 #5B4C10 #105B26

square

#101F5B #5B1044 #5B4C10 #105B26

split-complementary

#101F5B #5B2610 #445B10

monochromatic

#05091A #070D27 #101F5B #19318F #2242C3

Accessibility & contrast

On white

15.34

#101F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.37

#101F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #101F5B

15.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##101F5B	#FFFFFF	#000000	##FFFFFF
##101F5B	1.00	15.34	1.37	15.34
#FFFFFF	15.34	1.00	21.00	1.00
#000000	1.37	21.00	1.00	21.00
##FFFFFF	15.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00295D

Deuteranopia (green-blind)

#00225A

Tritanopia (blue-blind)

#002E39

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #101f5b;
/* rgb */ color: rgb(16, 31, 91);
/* oklch */ color: oklch(27.1% 0.109 267.5);

Tailwind

colors: {
  custom: {
    50: '#5c5a8a',
    500: '#101f5b',
    950: '#000000',
  },
}

SCSS

$custom: #101f5b;
$custom-light: #5c5a8a;
$custom-dark: #000000;

JSON

{
  "hex": "#101f5b",
  "rgb": {
    "r": 16,
    "g": 31,
    "b": 91
  },
  "hsl": {
    "h": 228,
    "s": 70.093,
    "l": 20.98
  },
  "oklch": {
    "l": 0.27129,
    "c": 0.10916,
    "h": 267.5
  },
  "luminance": 0.01845
}

Semantic roles & 50–950 ramp

primary

#101F5B

secondary

#948133

accent

#C93BED

background

#F5F5F8

surface

#E9E9F0

border

#C5C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #101F5B

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

Preview Lab → · Contrast checker → · Palette generator →