What color is #ECF3F9?

#ECF3F9 is a pale low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(236, 243, 249), and in HSL hsl(208, 52%, 95%).

Is #ECF3F9 accessible as text?

On white, #ECF3F9 has a contrast ratio of 1.12:1 (fails WCAG AA for body text); on black it is 18.75:1 (passes). For text placed on #ECF3F9, use black for the best readability.

What is the closest Tailwind color to #ECF3F9?

The nearest Tailwind CSS token is slate-100 (#F1F5F9).

What colors go well with #ECF3F9?

As a neutral, #ECF3F9 pairs cleanly with charcoal, near-black and dark grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a soft background and let the accent carry the color.

Is #ECF3F9 the same as CSS whitesmoke?

No — #ECF3F9 is not the CSS named color whitesmoke, but whitesmoke (#F5F5F5) is the closest CSS named color.

#ECF3F9 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #ECF3F9

Not just a swatch — here's how #ECF3F9 works with other colors. Named schemes with #ECF3F9 in its natural role, and a note on why the supporting colors balance it.

Japanese Sand Base · 5 colors

Base #ECF3F9 Surface #ECEADC Highlight #F4F2E7 Secondary #B2B2A0 Ink #2A2823

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.

Coastal Morning Lead · 5 colors

Lead #ECF3F9 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 Anchor #20344A

Cool White opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #ECF3F9 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #F5FBFF

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.

Nordic Calm Accent · 5 colors

Accent #ECF3F9 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Cool White keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #ECF3F9 Secondary #F8FAFD Support #969386 Ink #16140F

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.

Build a working theme in the generator →

Color Lab

How #ECF3F9 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.

Warmth 47/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 94/100

Very high

Soft and easy on the eye — gentle backdrops, calm surfaces.

Depth 4/100

Very low

Airy and open — recedes, leaves the composition light.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 13/100

Very low

Clean and current — no dusty, aged cast.

Luxury 7/100

Very low

Playful and accessible rather than exclusive.

Brand distinctiveness 4/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 2/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 93/100

Very high

Calm enough for large fills — backgrounds, cards, sections.

Print safety 97/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #ECF3F9

For UI

For branding

For interior

For fashion

People also use #ECF3F9 with

Pale Turquoise Cool White Linen Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AAA

Body text Do not use for body copy on light surfaces. Avoid

Large display Only on dark surfaces. Avoid

Background Pair with #141310 text at 16.6:1. Use

Subtle surface Use #FBFDFD for cards and hover fills. Tint 80

Avoid beside #ECEEF9 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #ECF3F9 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #ECF3F9;
  --color-base-rgb: 236 243 249;
  --color-base-oklch: oklch(96.1% 0.011 243.7);
  --color-50: #F3F8FC;
  --color-100: #DFEBF6;
  --color-200: #C1D8EB;
  --color-300: #96BAD9;
  --color-400: #6E9CC4;
  --color-500: #4D7DA8;
  --color-600: #416381;
  --color-700: #32495C;
  --color-800: #24313D;
  --color-900: #181F26;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  cool-white: {
    50: '#F3F8FC',
    100: '#DFEBF6',
    200: '#C1D8EB',
    300: '#96BAD9',
    400: '#6E9CC4',
    500: '#4D7DA8',
    600: '#416381',
    700: '#32495C',
    800: '#24313D',
    900: '#181F26',
  },
}

$base: #ECF3F9;
$base-ink: #141310;
$base-50: #F3F8FC;
$base-100: #DFEBF6;
$base-200: #C1D8EB;
$base-300: #96BAD9;
$base-400: #6E9CC4;
$base-500: #4D7DA8;
$base-600: #416381;
$base-700: #32495C;
$base-800: #24313D;
$base-900: #181F26;
$base-hover: #A2C4E2;
$base-subtle: #FAFBFD;

{
    "color": {
        "base": {
            "value": "#ECF3F9",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#DFEBF6",
                "type": "color"
            },
            "200": {
                "value": "#C1D8EB",
                "type": "color"
            },
            "300": {
                "value": "#96BAD9",
                "type": "color"
            },
            "400": {
                "value": "#6E9CC4",
                "type": "color"
            },
            "500": {
                "value": "#4D7DA8",
                "type": "color"
            },
            "600": {
                "value": "#416381",
                "type": "color"
            },
            "700": {
                "value": "#32495C",
                "type": "color"
            },
            "800": {
                "value": "#24313D",
                "type": "color"
            },
            "900": {
                "value": "#181F26",
                "type": "color"
            }
        }
    }
}

Palettes built on #ECF3F9

Color Lab

Pairs with #ECF3F9

UI roles & guardrails

In real applications

Scales

Every model

Export