What color is #66A1E1?

#66A1E1 is a light, soft blue. In RGB it is rgb(102, 161, 225), and in HSL hsl(211, 67%, 64%).

Is #66A1E1 accessible as text?

On white, #66A1E1 has a contrast ratio of 2.71:1 (fails WCAG AA for body text); on black it is 7.75:1 (passes). For text placed on #66A1E1, use black for the best readability.

What is the closest Tailwind color to #66A1E1?

The nearest Tailwind CSS token is blue-400 (#51A2FF).

What colors go well with #66A1E1?

#66A1E1 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E1A566. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66A1E1 below.

Is #66A1E1 good for buttons?

#66A1E1 works well for buttons and highlights, but use black text on #66A1E1 — white text only reaches 2.71:1, below the 4.5:1 needed for normal-size labels.

Is #66A1E1 the same as CSS cornflowerblue?

No — #66A1E1 is not the CSS named color cornflowerblue, but cornflowerblue (#6495ED) is the closest CSS named color.

#66A1E1 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66A1E1

Not just a swatch — here's how #66A1E1 works with other colors. Named schemes with #66A1E1 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #66A1E1 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Carolina 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 #66A1E1 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Carolina 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 #66A1E1 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #91C7FF

Carolina 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 Carolina Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #66A1E1 Secondary #B7CBE3 Support #959386 Ink #16140F

Carolina 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 Carolina Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #66A1E1 Anchor #3B2924 Surface #EAE5D0 Accent #799E78 Secondary #393933

Carolina 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 #66A1E1 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 19/100

Cool

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

Softness 56/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 31/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 39/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 44/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 60/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 37/100

Low

Usable as a tinted surface in measured doses.

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66A1E1

For UI

For branding

For interior

For fashion

People also use #66A1E1 with

Powder Blue Medium Slate Blue Fawn Gainsboro Charcoal

UI roles & guardrails

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

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 6.9:1. Use

Subtle surface Use #E4ECF5 for cards and hover fills. Tint 80

Avoid beside #6678E1 — 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 #66A1E1 at work across the surfaces designers actually ship.

Website / UI

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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: #66A1E1;
  --color-base-rgb: 102 161 225;
  --color-base-oklch: oklch(69.5% 0.113 251.6);
  --color-50: #F2F7FD;
  --color-100: #DCEAF9;
  --color-200: #BBD5F1;
  --color-300: #8CB6E3;
  --color-400: #6297D0;
  --color-500: #3F78B5;
  --color-600: #37608B;
  --color-700: #2C4662;
  --color-800: #203041;
  --color-900: #161E28;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  carolina-blue: {
    50: '#F2F7FD',
    100: '#DCEAF9',
    200: '#BBD5F1',
    300: '#8CB6E3',
    400: '#6297D0',
    500: '#3F78B5',
    600: '#37608B',
    700: '#2C4662',
    800: '#203041',
    900: '#161E28',
  },
}

$base: #66A1E1;
$base-ink: #141310;
$base-50: #F2F7FD;
$base-100: #DCEAF9;
$base-200: #BBD5F1;
$base-300: #8CB6E3;
$base-400: #6297D0;
$base-500: #3F78B5;
$base-600: #37608B;
$base-700: #2C4662;
$base-800: #203041;
$base-900: #161E28;
$base-hover: #2F80D6;
$base-subtle: #D5E3F1;

{
    "color": {
        "base": {
            "value": "#66A1E1",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FD",
                "type": "color"
            },
            "100": {
                "value": "#DCEAF9",
                "type": "color"
            },
            "200": {
                "value": "#BBD5F1",
                "type": "color"
            },
            "300": {
                "value": "#8CB6E3",
                "type": "color"
            },
            "400": {
                "value": "#6297D0",
                "type": "color"
            },
            "500": {
                "value": "#3F78B5",
                "type": "color"
            },
            "600": {
                "value": "#37608B",
                "type": "color"
            },
            "700": {
                "value": "#2C4662",
                "type": "color"
            },
            "800": {
                "value": "#203041",
                "type": "color"
            },
            "900": {
                "value": "#161E28",
                "type": "color"
            }
        }
    }
}

Palettes built on #66A1E1

Color Lab

Pairs with #66A1E1

UI roles & guardrails

In real applications

Scales

Every model

Export