#1F28B3#1F28B3

#1F28B3 is a dark, highly saturated blue. Relative luminance 0.051; OKLCH L 39.0% C 0.211 H 268.9°. Best body text is #FFFFFF at 10.43:1 contrast (WCAG AA passes).

Color values

HEX	#1F28B3
RGB	rgb(31, 40, 179)
HSL	hsl(236, 70%, 41%)
HSV	hsv(236, 83%, 70%)
CMYK	cmyk(82.7%, 77.7%, 0%, 29.8%)
CIE-LAB	lab(26.91, 46.73, -72.88)
CIE-LCH	lch(26.91, 86.58, 302.67°)
OKLab	oklab(38.97% -0.0039 -0.2112)
OKLCH	oklch(38.97% 0.211 268.9)
XYZ	xyz(9.4578, 5.0624, 43.1178)
Luminance	0.0506 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F28B3 #B3AA1F

analogous

#1F72B3 #1F28B3 #601FB3

triadic

#1F28B3 #B31F28 #28B31F

tetradic

#1F28B3 #B31F72 #B3AA1F #1FB360

square

#1F28B3 #B31F72 #B3AA1F #1FB360

split-complementary

#1F28B3 #B3601F #72B31F

monochromatic

#0D114B #161C7F #1F28B3 #333EDC #686FE5

Accessibility & contrast

On white

10.43

#1F28B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1F28B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F28B3

10.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F28B3	#FFFFFF	#000000	##FFFFFF
##1F28B3	1.00	10.43	2.01	10.43
#FFFFFF	10.43	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047B7

Deuteranopia (green-blind)

#0038B1

Tritanopia (blue-blind)

#00526D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f28b3;
/* rgb */ color: rgb(31, 40, 179);
/* oklch */ color: oklch(39.0% 0.211 268.9);

Tailwind

colors: {
  custom: {
    50: '#7864cb',
    500: '#1f28b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f28b3;
$custom-light: #7864cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f28b3",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 179
  },
  "hsl": {
    "h": 236.351,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.38974,
    "c": 0.2112,
    "h": 268.9
  },
  "luminance": 0.05064
}

Semantic roles & 50–950 ramp

primary

#1F28B3

secondary

#CAC464

accent

#E23BED

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0B0513

muted

#7C7A82

Preview Lab

Preview with #1F28B3

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

Preview Lab → · Contrast checker → · Palette generator →