#407FAE is a mid-toned, cool blue. On the Color Lab it reads clean and engineered. It carries a legible label as a UI accent and sits well as a supporting tone.
Not just a swatch — here's how #407FAE works with other colors. Named schemes with #407FAE in its natural role, and a note on why the supporting colors balance it.
Steel Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Steel Blue is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Steel Blue.
Steel Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.
Steel Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.
Steel Blue 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 Steel Blue carrying the quiet middle.
How #407FAE 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 #407FAE at work across the surfaces designers actually ship.
:root {
--color-base: #407FAE;
--color-base-rgb: 64 127 174;
--color-base-oklch: oklch(57.5% 0.098 243.2);
--color-50: #F3F8FB;
--color-100: #E1ECF5;
--color-200: #C4D9E9;
--color-300: #9ABCD5;
--color-400: #739EBF;
--color-500: #5280A3;
--color-600: #44657E;
--color-700: #354A5A;
--color-800: #25323C;
--color-900: #181F25;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
steel-blue: {
50: '#F3F8FB',
100: '#E1ECF5',
200: '#C4D9E9',
300: '#9ABCD5',
400: '#739EBF',
500: '#5280A3',
600: '#44657E',
700: '#354A5A',
800: '#25323C',
900: '#181F25',
},
}
$base: #407FAE; $base-ink: #141310; $base-50: #F3F8FB; $base-100: #E1ECF5; $base-200: #C4D9E9; $base-300: #9ABCD5; $base-400: #739EBF; $base-500: #5280A3; $base-600: #44657E; $base-700: #354A5A; $base-800: #25323C; $base-900: #181F25; $base-hover: #34668C; $base-subtle: #C8D8E5;
{
"color": {
"base": {
"value": "#407FAE",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F3F8FB",
"type": "color"
},
"100": {
"value": "#E1ECF5",
"type": "color"
},
"200": {
"value": "#C4D9E9",
"type": "color"
},
"300": {
"value": "#9ABCD5",
"type": "color"
},
"400": {
"value": "#739EBF",
"type": "color"
},
"500": {
"value": "#5280A3",
"type": "color"
},
"600": {
"value": "#44657E",
"type": "color"
},
"700": {
"value": "#354A5A",
"type": "color"
},
"800": {
"value": "#25323C",
"type": "color"
},
"900": {
"value": "#181F25",
"type": "color"
}
}
}
}