What color is #6699BC?

#6699BC is a medium cyan-blue. In RGB it is rgb(102, 153, 188), and in HSL hsl(204, 39%, 57%).

Is #6699BC accessible as text?

On white, #6699BC has a contrast ratio of 3.07:1 (fails WCAG AA for body text); on black it is 6.85:1 (passes). For text placed on #6699BC, use black for the best readability.

What is the closest Tailwind color to #6699BC?

The nearest Tailwind CSS token is cyan-600 (#0092B8).

What colors go well with #6699BC?

#6699BC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BC8967. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #6699BC below.

Is #6699BC good for buttons?

#6699BC works well for buttons and highlights, but use black text on #6699BC — white text only reaches 3.07:1, below the 4.5:1 needed for normal-size labels.

Is #6699BC the same as CSS cadetblue?

No — #6699BC is not the CSS named color cadetblue, but cadetblue (#5F9EA0) is the closest CSS named color.

#6699BC Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #6699BC

Not just a swatch — here's how #6699BC works with other colors. Named schemes with #6699BC in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #6699BC 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.

Coastal Morning Lead · 5 colors

Lead #6699BC Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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

Japanese Sand Base · 5 colors

Base #6699BC Surface #ECEADC Highlight #F4F2E7 Secondary #B2B2A0 Ink #2A2823

Carolina Blue 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.

Tech Product Signal · 5 colors

Signal #6699BC Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #90BEDF

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 #6699BC Secondary #AFC1CD Support #969386 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.

Build a working theme in the generator →

Color Lab

How #6699BC 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 28/100

Cool

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

Softness 58/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 33/100

Low

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 40/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 29/100

Low

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

UI accent fit 63/100

High

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

Surface fit 45/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #6699BC

For UI

For branding

For interior

For fashion

People also use #6699BC with

Medium Aquamarine Very Peri Camel Platinum 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 Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 6.1:1. Use

Subtle surface Use #E3EAEF for cards and hover fills. Tint 80

Avoid beside #677DBC — 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 #6699BC 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: #6699BC;
  --color-base-rgb: 102 153 188;
  --color-base-oklch: oklch(66.0% 0.076 239.4);
  --color-50: #F4F8FB;
  --color-100: #E2ECF3;
  --color-200: #C6D9E6;
  --color-300: #9EBDD1;
  --color-400: #799FB9;
  --color-500: #58819D;
  --color-600: #496679;
  --color-700: #384B57;
  --color-800: #27323A;
  --color-900: #192024;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  carolina-blue: {
    50: '#F4F8FB',
    100: '#E2ECF3',
    200: '#C6D9E6',
    300: '#9EBDD1',
    400: '#799FB9',
    500: '#58819D',
    600: '#496679',
    700: '#384B57',
    800: '#27323A',
    900: '#192024',
  },
}

$base: #6699BC;
$base-ink: #141310;
$base-50: #F4F8FB;
$base-100: #E2ECF3;
$base-200: #C6D9E6;
$base-300: #9EBDD1;
$base-400: #799FB9;
$base-500: #58819D;
$base-600: #496679;
$base-700: #384B57;
$base-800: #27323A;
$base-900: #192024;
$base-hover: #477DA2;
$base-subtle: #D4E0E8;

{
    "color": {
        "base": {
            "value": "#6699BC",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E2ECF3",
                "type": "color"
            },
            "200": {
                "value": "#C6D9E6",
                "type": "color"
            },
            "300": {
                "value": "#9EBDD1",
                "type": "color"
            },
            "400": {
                "value": "#799FB9",
                "type": "color"
            },
            "500": {
                "value": "#58819D",
                "type": "color"
            },
            "600": {
                "value": "#496679",
                "type": "color"
            },
            "700": {
                "value": "#384B57",
                "type": "color"
            },
            "800": {
                "value": "#27323A",
                "type": "color"
            },
            "900": {
                "value": "#192024",
                "type": "color"
            }
        }
    }
}

Palettes built on #6699BC

Color Lab

Pairs with #6699BC

UI roles & guardrails

In real applications

Scales

Every model

Export