#3C71AA is a mid-toned, cool indigo. 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 #3C71AA works with other colors. Named schemes with #3C71AA 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 #3C71AA 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 #3C71AA at work across the surfaces designers actually ship.
:root {
--color-base: #3C71AA;
--color-base-rgb: 60 113 170;
--color-base-oklch: oklch(53.9% 0.106 251.9);
--color-50: #F3F7FB;
--color-100: #E0EAF5;
--color-200: #C3D6EA;
--color-300: #99B7D7;
--color-400: #7198C1;
--color-500: #5079A5;
--color-600: #43607F;
--color-700: #34475B;
--color-800: #25303C;
--color-900: #181E25;
--color-on-base: #FFFFFF;
}
// tailwind.config.js
colors: {
steel-blue: {
50: '#F3F7FB',
100: '#E0EAF5',
200: '#C3D6EA',
300: '#99B7D7',
400: '#7198C1',
500: '#5079A5',
600: '#43607F',
700: '#34475B',
800: '#25303C',
900: '#181E25',
},
}
$base: #3C71AA; $base-ink: #FFFFFF; $base-50: #F3F7FB; $base-100: #E0EAF5; $base-200: #C3D6EA; $base-300: #99B7D7; $base-400: #7198C1; $base-500: #5079A5; $base-600: #43607F; $base-700: #34475B; $base-800: #25303C; $base-900: #181E25; $base-hover: #305A88; $base-subtle: #C6D4E4;
{
"color": {
"base": {
"value": "#3C71AA",
"type": "color"
},
"onBase": {
"value": "#FFFFFF",
"type": "color"
},
"scale": {
"50": {
"value": "#F3F7FB",
"type": "color"
},
"100": {
"value": "#E0EAF5",
"type": "color"
},
"200": {
"value": "#C3D6EA",
"type": "color"
},
"300": {
"value": "#99B7D7",
"type": "color"
},
"400": {
"value": "#7198C1",
"type": "color"
},
"500": {
"value": "#5079A5",
"type": "color"
},
"600": {
"value": "#43607F",
"type": "color"
},
"700": {
"value": "#34475B",
"type": "color"
},
"800": {
"value": "#25303C",
"type": "color"
},
"900": {
"value": "#181E25",
"type": "color"
}
}
}
}