Accessibility
Vs white / black
5.99:1 · 3.51:1
Sources
Codes
HEX
#355fbb
RGB
rgb(53, 95, 187)
RGBA
rgba(53, 95, 187, 1)
HSL
hsl(221, 56%, 47%)
HSLA
hsla(221, 56%, 47%, 1)
HSV
hsv(221, 72%, 73%)
LAB
lab(42.04% 17.15 -52.83)
LCH
lch(42.04% 55.54 287.98)
OKLAB
oklab(0.5063 -0.0174 -0.1517)
OKLCH
oklch(0.5063 0.1527 263.46)
XYZ
xyz(14.53, 12.53, 48.66)
CMYK
cmyk(72%, 49%, 0%, 27%)
CSS
color: #355fbb;
CSS variable
--color-355fbb: #355fbb;
SCSS
$color-355fbb: #355fbb;
JavaScript
const color = "#355fbb";
TypeScript
const color: string = "#355fbb";
React
style={{ backgroundColor: "#355fbb" }}
JSON
{ "hex": "#355fbb", "rgb": { "r": 53, "g": 95, "b": 187 }, "oklch": "oklch(0.5063 0.1527 263.46)" }
Export
:root {
--#355fbb-1: #355fbb;
}Design systems
An arbitrary HEX is not an official Tailwind, Material, or Bootstrap color. Distance is CIEDE2000.
Nearest Tailwind color
blue-600
Very different · ΔE 5.91 · #2563EB
Nearest CSS named color
RoyalBlue
Very different · ΔE 6.22 · #4169E1
Nearest Material color
blue-800
Noticeably different · ΔE 4.09 · #1565C0
Nearest Bootstrap color
primary
Very different · ΔE 9.23 · #0D6EFD
OKLCH
Generated in OKLCH from this hex. Not an official Tailwind scale unless the hex itself is a Tailwind token.
Palette
Full scale from light tints through the base color into deep shades
Palette
Mixed toward white — soft backgrounds and highlights
Palette
Mixed toward black — depth, text, and emphasis
Palette
Mixed toward neutral grey — muted UI surfaces
Harmony
Opposite on the color wheel for contrast
Harmony
Neighbors that sit comfortably together
Harmony
Evenly spaced triad for vibrant sets
Harmony
Base plus two accents beside the complement
Harmony
Same hue, varied lightness and saturation
Using this color
#355FBB (#355fbb) sits in the blue family at about 221° hue, 56% saturation, and 47% lightness. Contrast is 5.99:1 on white and 3.51:1 on black, so white labels read more clearly on the swatch itself. Nearest Tailwind token: blue-600 (approximation unless the hex is an official scale stop).
Sensible jobs for this swatch
On a black or near-black UI, #355fbb is 3.51:1. Prefer it as a fill, border, or large heading rather than 16px copy.
Family context: Trust, calm, and professionalism. The most used color in SaaS, finance, and healthcare. Common uses still include buttons, charts, and accents in the Blue range — always verify the pair for this exact hex in the contrast checker.
Related
Nearby colors from the library by perceptual distance