What color is #66D1E7?

#66D1E7 is a light, vivid cyan. In RGB it is rgb(102, 209, 231), and in HSL hsl(190, 73%, 65%).

Is #66D1E7 accessible as text?

On white, #66D1E7 has a contrast ratio of 1.77:1 (fails WCAG AA for body text); on black it is 11.84:1 (passes). For text placed on #66D1E7, use black for the best readability.

What is the closest Tailwind color to #66D1E7?

The nearest Tailwind CSS token is sky-300 (#74D4FF).

What colors go well with #66D1E7?

#66D1E7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E77A65. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66D1E7 below.

Is #66D1E7 good for buttons?

#66D1E7 works well for buttons and highlights, but use black text on #66D1E7 — white text only reaches 1.77:1, below the 4.5:1 needed for normal-size labels.

Is #66D1E7 the same as CSS skyblue?

No — #66D1E7 is not the CSS named color skyblue, but skyblue (#87CEEB) is the closest CSS named color.

#66D1E7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66D1E7

Not just a swatch — here's how #66D1E7 works with other colors. Named schemes with #66D1E7 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #66D1E7 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1E3549

Sky 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 #66D1E7 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Sky 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 #66D1E7 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #9AF7FF

Sky 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 Sky Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #66D1E7 Secondary #D3F4FC Support #979286 Ink #16140F

Sky 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 Sky Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #66D1E7 Anchor #372C1D Surface #EBE5D0 Accent #7E9D74 Secondary #3A3933

Sky 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 #66D1E7 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 65/100

High

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

Depth 19/100

Very low

Airy and open — recedes, leaves the composition light.

Naturalness 4/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 27/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 40/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 25/100

Low

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

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66D1E7

For UI

For branding

For interior

For fashion

People also use #66D1E7 with

Seafoam Green Cornflower Blue Terracotta Platinum Dark Slate Gray

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 10.5:1. Use

Subtle surface Use #E4F3F7 for cards and hover fills. Tint 80

Avoid beside #65A6E7 — 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 #66D1E7 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: #66D1E7;
  --color-base-rgb: 102 209 231;
  --color-base-oklch: oklch(80.6% 0.103 213.0);
  --color-50: #F1FBFD;
  --color-100: #DBF5FA;
  --color-200: #B9EAF4;
  --color-300: #88D7E7;
  --color-400: #5DC1D5;
  --color-500: #3AA5BB;
  --color-600: #337F8E;
  --color-700: #2A5B65;
  --color-800: #1F3C42;
  --color-900: #152528;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  sky-blue: {
    50: '#F1FBFD',
    100: '#DBF5FA',
    200: '#B9EAF4',
    300: '#88D7E7',
    400: '#5DC1D5',
    500: '#3AA5BB',
    600: '#337F8E',
    700: '#2A5B65',
    800: '#1F3C42',
    900: '#152528',
  },
}

$base: #66D1E7;
$base-ink: #141310;
$base-50: #F1FBFD;
$base-100: #DBF5FA;
$base-200: #B9EAF4;
$base-300: #88D7E7;
$base-400: #5DC1D5;
$base-500: #3AA5BB;
$base-600: #337F8E;
$base-700: #2A5B65;
$base-800: #1F3C42;
$base-900: #152528;
$base-hover: #2BC0DE;
$base-subtle: #D5EEF3;

{
    "color": {
        "base": {
            "value": "#66D1E7",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FBFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF5FA",
                "type": "color"
            },
            "200": {
                "value": "#B9EAF4",
                "type": "color"
            },
            "300": {
                "value": "#88D7E7",
                "type": "color"
            },
            "400": {
                "value": "#5DC1D5",
                "type": "color"
            },
            "500": {
                "value": "#3AA5BB",
                "type": "color"
            },
            "600": {
                "value": "#337F8E",
                "type": "color"
            },
            "700": {
                "value": "#2A5B65",
                "type": "color"
            },
            "800": {
                "value": "#1F3C42",
                "type": "color"
            },
            "900": {
                "value": "#152528",
                "type": "color"
            }
        }
    }
}