#175C53 is a mid-toned, cool cyan. On the Color Lab it reads quietly premium, 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 #175C53 works with other colors. Named schemes with #175C53 in its natural role, and a note on why the supporting colors balance it.
Castleton Green opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Castleton Green keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.
Castleton Green plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.
Castleton Green anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.
Castleton Green 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 Castleton Green carrying the quiet middle.
How #175C53 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 #175C53 at work across the surfaces designers actually ship.
:root {
--color-base: #175C53;
--color-base-rgb: 23 92 83;
--color-base-oklch: oklch(43.0% 0.068 182.5);
--color-50: #F2FCFB;
--color-100: #DEF8F4;
--color-200: #BEEFE8;
--color-300: #91DED4;
--color-400: #67CBBD;
--color-500: #46AFA1;
--color-600: #3C867C;
--color-700: #2F6059;
--color-800: #223F3B;
--color-900: #162725;
--color-on-base: #FFFFFF;
}
// tailwind.config.js
colors: {
castleton-green: {
50: '#F2FCFB',
100: '#DEF8F4',
200: '#BEEFE8',
300: '#91DED4',
400: '#67CBBD',
500: '#46AFA1',
600: '#3C867C',
700: '#2F6059',
800: '#223F3B',
900: '#162725',
},
}
$base: #175C53; $base-ink: #FFFFFF; $base-50: #F2FCFB; $base-100: #DEF8F4; $base-200: #BEEFE8; $base-300: #91DED4; $base-400: #67CBBD; $base-500: #46AFA1; $base-600: #3C867C; $base-700: #2F6059; $base-800: #223F3B; $base-900: #162725; $base-hover: #134B44; $base-subtle: #A9DFD8;
{
"color": {
"base": {
"value": "#175C53",
"type": "color"
},
"onBase": {
"value": "#FFFFFF",
"type": "color"
},
"scale": {
"50": {
"value": "#F2FCFB",
"type": "color"
},
"100": {
"value": "#DEF8F4",
"type": "color"
},
"200": {
"value": "#BEEFE8",
"type": "color"
},
"300": {
"value": "#91DED4",
"type": "color"
},
"400": {
"value": "#67CBBD",
"type": "color"
},
"500": {
"value": "#46AFA1",
"type": "color"
},
"600": {
"value": "#3C867C",
"type": "color"
},
"700": {
"value": "#2F6059",
"type": "color"
},
"800": {
"value": "#223F3B",
"type": "color"
},
"900": {
"value": "#162725",
"type": "color"
}
}
}
}