#1F5BB3#1F5BB3

#1F5BB3 is a mid, vivid blue. Relative luminance 0.110; OKLCH L 48.4% C 0.153 H 258.6°. Best body text is #FFFFFF at 6.55:1 contrast (WCAG AA passes).

Color values

HEX	#1F5BB3
RGB	rgb(31, 91, 179)
HSL	hsl(216, 70%, 41%)
HSV	hsv(216, 83%, 70%)
CMYK	cmyk(82.7%, 49.2%, 0%, 29.8%)
CIE-LAB	lab(39.63, 14.10, -52.08)
CIE-LCH	lch(39.63, 53.96, 285.15°)
OKLab	oklab(48.39% -0.0302 -0.1499)
OKLCH	oklch(48.39% 0.153 258.6)
XYZ	xyz(12.4399, 11.0266, 44.1118)
Luminance	0.1103 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F5BB3 #B3771F

analogous

#1FA5B3 #1F5BB3 #2D1FB3

triadic

#1F5BB3 #B31F5B #5BB31F

tetradic

#1F5BB3 #B31FA5 #B3771F #1FB32D

square

#1F5BB3 #B31FA5 #B3771F #1FB32D

split-complementary

#1F5BB3 #B32D1F #A5B31F

monochromatic

#0D264B #16407F #1F5BB3 #3378DC #689AE5

Accessibility & contrast

On white

6.55

#1F5BB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.21

#1F5BB3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F5BB3

6.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F5BB3	#FFFFFF	#000000	##FFFFFF
##1F5BB3	1.00	6.55	3.21	6.55
#FFFFFF	6.55	1.00	21.00	1.00
#000000	3.21	21.00	1.00	21.00
##FFFFFF	6.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2764B6

Deuteranopia (green-blind)

#0057B1

Tritanopia (blue-blind)

#00707E

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #1f5bb3;
/* rgb */ color: rgb(31, 91, 179);
/* oklch */ color: oklch(48.4% 0.153 258.6);

Tailwind

colors: {
  custom: {
    50: '#7488ca',
    500: '#1f5bb3',
    950: '#000000',
  },
}

SCSS

$custom: #1f5bb3;
$custom-light: #7488ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1f5bb3",
  "rgb": {
    "r": 31,
    "g": 91,
    "b": 179
  },
  "hsl": {
    "h": 215.676,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.48392,
    "c": 0.15288,
    "h": 258.6
  },
  "luminance": 0.11028
}

Semantic roles & 50–950 ramp

primary

#1F5BB3

secondary

#CAA164

accent

#A53BED

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F5BB3

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

Preview Lab → · Contrast checker → · Palette generator →