#3F616D is a muted, 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 #3F616D works with other colors. Named schemes with #3F616D in its natural role, and a note on why the supporting colors balance it.
Feldgrau opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Feldgrau keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.
Feldgrau is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Feldgrau.
Feldgrau plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.
Feldgrau 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 Feldgrau carrying the quiet middle.
How #3F616D 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 #3F616D at work across the surfaces designers actually ship.
:root {
--color-base: #3F616D;
--color-base-rgb: 63 97 109;
--color-base-oklch: oklch(47.1% 0.044 222.2);
--color-50: #F5F8FA;
--color-100: #E5EDF0;
--color-200: #CBDBE1;
--color-300: #A6C0C9;
--color-400: #83A3AF;
--color-500: #638592;
--color-600: #506972;
--color-700: #3D4C52;
--color-800: #2A3337;
--color-900: #1B2022;
--color-on-base: #FFFFFF;
}
// tailwind.config.js
colors: {
feldgrau: {
50: '#F5F8FA',
100: '#E5EDF0',
200: '#CBDBE1',
300: '#A6C0C9',
400: '#83A3AF',
500: '#638592',
600: '#506972',
700: '#3D4C52',
800: '#2A3337',
900: '#1B2022',
},
}
$base: #3F616D; $base-ink: #FFFFFF; $base-50: #F5F8FA; $base-100: #E5EDF0; $base-200: #CBDBE1; $base-300: #A6C0C9; $base-400: #83A3AF; $base-500: #638592; $base-600: #506972; $base-700: #3D4C52; $base-800: #2A3337; $base-900: #1B2022; $base-hover: #334E58; $base-subtle: #C2D1D7;
{
"color": {
"base": {
"value": "#3F616D",
"type": "color"
},
"onBase": {
"value": "#FFFFFF",
"type": "color"
},
"scale": {
"50": {
"value": "#F5F8FA",
"type": "color"
},
"100": {
"value": "#E5EDF0",
"type": "color"
},
"200": {
"value": "#CBDBE1",
"type": "color"
},
"300": {
"value": "#A6C0C9",
"type": "color"
},
"400": {
"value": "#83A3AF",
"type": "color"
},
"500": {
"value": "#638592",
"type": "color"
},
"600": {
"value": "#506972",
"type": "color"
},
"700": {
"value": "#3D4C52",
"type": "color"
},
"800": {
"value": "#2A3337",
"type": "color"
},
"900": {
"value": "#1B2022",
"type": "color"
}
}
}
}