#E4EFF9 is a light neutral with only a whisper of temperate cast. On the Color Lab it reads clean and engineered, restrained and easy to live with. It holds up as a large surface and is too pale to lead as a primary accent.
Not just a swatch — here's how #E4EFF9 works with other colors. Named schemes with #E4EFF9 in its natural role, and a note on why the supporting colors balance it.
Cool White sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.
Cool White opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Cool White is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Cool White.
Cool White keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.
Cool White 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 Cool White carrying the quiet middle.
How #E4EFF9 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 #E4EFF9 at work across the surfaces designers actually ship.
:root {
--color-base: #E4EFF9;
--color-base-rgb: 228 239 249;
--color-base-oklch: oklch(94.7% 0.018 245.4);
--color-50: #F2F8FD;
--color-100: #DDEBF8;
--color-200: #BCD7F0;
--color-300: #8EB9E1;
--color-400: #649BCE;
--color-500: #427CB3;
--color-600: #396289;
--color-700: #2E4861;
--color-800: #213140;
--color-900: #161F27;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
cool-white: {
50: '#F2F8FD',
100: '#DDEBF8',
200: '#BCD7F0',
300: '#8EB9E1',
400: '#649BCE',
500: '#427CB3',
600: '#396289',
700: '#2E4861',
800: '#213140',
900: '#161F27',
},
}
$base: #E4EFF9; $base-ink: #141310; $base-50: #F2F8FD; $base-100: #DDEBF8; $base-200: #BCD7F0; $base-300: #8EB9E1; $base-400: #649BCE; $base-500: #427CB3; $base-600: #396289; $base-700: #2E4861; $base-800: #213140; $base-900: #161F27; $base-hover: #97C1E8; $base-subtle: #F8FAFD;
{
"color": {
"base": {
"value": "#E4EFF9",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F2F8FD",
"type": "color"
},
"100": {
"value": "#DDEBF8",
"type": "color"
},
"200": {
"value": "#BCD7F0",
"type": "color"
},
"300": {
"value": "#8EB9E1",
"type": "color"
},
"400": {
"value": "#649BCE",
"type": "color"
},
"500": {
"value": "#427CB3",
"type": "color"
},
"600": {
"value": "#396289",
"type": "color"
},
"700": {
"value": "#2E4861",
"type": "color"
},
"800": {
"value": "#213140",
"type": "color"
},
"900": {
"value": "#161F27",
"type": "color"
}
}
}
}