What color is #66BCDF?

#66BCDF is a light, soft cyan-blue. In RGB it is rgb(102, 188, 223), and in HSL hsl(197, 65%, 64%).

Is #66BCDF accessible as text?

On white, #66BCDF has a contrast ratio of 2.14:1 (fails WCAG AA for body text); on black it is 9.82:1 (passes). For text placed on #66BCDF, use black for the best readability.

What is the closest Tailwind color to #66BCDF?

The nearest Tailwind CSS token is cyan-500 (#00B8DB).

What colors go well with #66BCDF?

#66BCDF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DF8968. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66BCDF below.

Is #66BCDF good for buttons?

#66BCDF works well for buttons and highlights, but use black text on #66BCDF — white text only reaches 2.14:1, below the 4.5:1 needed for normal-size labels.

Is #66BCDF the same as CSS deepskyblue?

No — #66BCDF is not the CSS named color deepskyblue, but deepskyblue (#00BFFF) is the closest CSS named color.

#66BCDF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66BCDF

Not just a swatch — here's how #66BCDF works with other colors. Named schemes with #66BCDF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #66BCDF Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

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

Nordic Calm Accent · 5 colors

Accent #66BCDF Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

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

Tech Product Signal · 5 colors

Signal #66BCDF Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #96E2FF

Lagoon 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 Lagoon Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #66BCDF Secondary #C6E1EE Support #969386 Ink #16140F

Lagoon 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 Lagoon Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #66BCDF Anchor #372C1D Surface #EBE5D0 Accent #7C9D75 Secondary #393933

Lagoon Blue 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.

Build a working theme in the generator →

Color Lab

How #66BCDF 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 21/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 62/100

High

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

Depth 24/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 32/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 39/100

Low

Workable accent with care around contrast.

Surface fit 47/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 74/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66BCDF

For UI

For branding

For interior

For fashion

People also use #66BCDF with

Seafoam Green Medium Slate Blue Dark Salmon Platinum 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 8.7:1. Use

Subtle surface Use #E4F0F5 for cards and hover fills. Tint 80

Avoid beside #6895DF — 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 #66BCDF at work across the surfaces designers actually ship.

Website / UI

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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: #66BCDF;
  --color-base-rgb: 102 188 223;
  --color-base-oklch: oklch(75.5% 0.097 226.8);
  --color-50: #F2FAFD;
  --color-100: #DDF1F9;
  --color-200: #BCE2F1;
  --color-300: #8ECAE2;
  --color-400: #63B0CF;
  --color-500: #4193B4;
  --color-600: #387289;
  --color-700: #2D5362;
  --color-800: #213740;
  --color-900: #162227;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  lagoon-blue: {
    50: '#F2FAFD',
    100: '#DDF1F9',
    200: '#BCE2F1',
    300: '#8ECAE2',
    400: '#63B0CF',
    500: '#4193B4',
    600: '#387289',
    700: '#2D5362',
    800: '#213740',
    900: '#162227',
  },
}

$base: #66BCDF;
$base-ink: #141310;
$base-50: #F2FAFD;
$base-100: #DDF1F9;
$base-200: #BCE2F1;
$base-300: #8ECAE2;
$base-400: #63B0CF;
$base-500: #4193B4;
$base-600: #387289;
$base-700: #2D5362;
$base-800: #213740;
$base-900: #162227;
$base-hover: #32A6D3;
$base-subtle: #D6E9F1;

{
    "color": {
        "base": {
            "value": "#66BCDF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FAFD",
                "type": "color"
            },
            "100": {
                "value": "#DDF1F9",
                "type": "color"
            },
            "200": {
                "value": "#BCE2F1",
                "type": "color"
            },
            "300": {
                "value": "#8ECAE2",
                "type": "color"
            },
            "400": {
                "value": "#63B0CF",
                "type": "color"
            },
            "500": {
                "value": "#4193B4",
                "type": "color"
            },
            "600": {
                "value": "#387289",
                "type": "color"
            },
            "700": {
                "value": "#2D5362",
                "type": "color"
            },
            "800": {
                "value": "#213740",
                "type": "color"
            },
            "900": {
                "value": "#162227",
                "type": "color"
            }
        }
    }
}