#558593 is a mid-toned, cool blue. On the Color Lab it reads clean and engineered, restrained and easy to live with. It carries a legible label as a UI accent and reproduces cleanly in print.
Not just a swatch — here's how #558593 works with other colors. Named schemes with #558593 in its natural role, and a note on why the supporting colors balance it.
Slate Gray opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Slate Gray keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.
Slate Gray is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Slate Gray.
Slate Gray plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.
Slate Gray is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Slate Gray carrying the quiet middle.
How #558593 actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.
Not a swatch to memorise — a color to build with. Here is #558593 at work across the surfaces designers actually ship.
:root {
--color-base: #558593;
--color-base-rgb: 85 133 147;
--color-base-oklch: oklch(58.8% 0.056 218.2);
--color-50: #F5F9FA;
--color-100: #E5EEF0;
--color-200: #CBDCE1;
--color-300: #A6C1C9;
--color-400: #83A5AF;
--color-500: #638792;
--color-600: #506A72;
--color-700: #3D4D52;
--color-800: #2A3437;
--color-900: #1B2122;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
slate-gray: {
50: '#F5F9FA',
100: '#E5EEF0',
200: '#CBDCE1',
300: '#A6C1C9',
400: '#83A5AF',
500: '#638792',
600: '#506A72',
700: '#3D4D52',
800: '#2A3437',
900: '#1B2122',
},
}
$base: #558593; $base-ink: #141310; $base-50: #F5F9FA; $base-100: #E5EEF0; $base-200: #CBDCE1; $base-300: #A6C1C9; $base-400: #83A5AF; $base-500: #638792; $base-600: #506A72; $base-700: #3D4D52; $base-800: #2A3437; $base-900: #1B2122; $base-hover: #436975; $base-subtle: #CCDADE;
{
"color": {
"base": {
"value": "#558593",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F5F9FA",
"type": "color"
},
"100": {
"value": "#E5EEF0",
"type": "color"
},
"200": {
"value": "#CBDCE1",
"type": "color"
},
"300": {
"value": "#A6C1C9",
"type": "color"
},
"400": {
"value": "#83A5AF",
"type": "color"
},
"500": {
"value": "#638792",
"type": "color"
},
"600": {
"value": "#506A72",
"type": "color"
},
"700": {
"value": "#3D4D52",
"type": "color"
},
"800": {
"value": "#2A3437",
"type": "color"
},
"900": {
"value": "#1B2122",
"type": "color"
}
}
}
}