What color is #668CB0?

#668CB0 is a medium, muted blue. In RGB it is rgb(102, 140, 176), and in HSL hsl(209, 32%, 55%).

Is #668CB0 accessible as text?

On white, #668CB0 has a contrast ratio of 3.53:1 (fails WCAG AA for body text); on black it is 5.94:1 (passes). For text placed on #668CB0, use black for the best readability.

What is the closest Tailwind color to #668CB0?

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

What colors go well with #668CB0?

#668CB0 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B18B68. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #668CB0 below.

Is #668CB0 good for buttons?

#668CB0 works well for buttons and highlights, but use black text on #668CB0 — white text only reaches 3.53:1, below the 4.5:1 needed for normal-size labels.

Is #668CB0 the same as CSS lightslategray?

No — #668CB0 is not the CSS named color lightslategray, but lightslategray (#778899) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#668CB0 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #668CB0

Not just a swatch — here's how #668CB0 works with other colors. Named schemes with #668CB0 in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #668CB0 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Air Force 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 #668CB0 Accent #A5C4C0 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Air Force 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 #668CB0 Surface #ECEADC Highlight #F4F2E7 Secondary #B2B2A0 Ink #2C2724

Air Force 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 #668CB0 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #8EB1D3

Air Force 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 Air Force Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #668CB0 Secondary #A7B5C2 Support #969386 Ink #16140F

Air Force 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 Air Force Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #668CB0 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 30/100

Cool

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

Softness 56/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 36/100

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 48/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 27/100

Low

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

UI accent fit 69/100

High

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

Surface fit 43/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 84/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #668CB0

For UI

For branding

For interior

For fashion

People also use #668CB0 with

Laurel Green Very Peri Beaver 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 Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 5.3:1. Use

Subtle surface Use #E3E8ED for cards and hover fills. Tint 80

Avoid beside #6875B1 — 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 #668CB0 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: #668CB0;
  --color-base-rgb: 102 140 176;
  --color-base-oklch: oklch(62.6% 0.069 247.6);
  --color-50: #F5F7FA;
  --color-100: #E4EBF2;
  --color-200: #C9D7E3;
  --color-300: #A3B8CC;
  --color-400: #7F9AB3;
  --color-500: #5E7B97;
  --color-600: #4D6275;
  --color-700: #3A4854;
  --color-800: #293138;
  --color-900: #1A1F23;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  air-force-blue: {
    50: '#F5F7FA',
    100: '#E4EBF2',
    200: '#C9D7E3',
    300: '#A3B8CC',
    400: '#7F9AB3',
    500: '#5E7B97',
    600: '#4D6275',
    700: '#3A4854',
    800: '#293138',
    900: '#1A1F23',
  },
}

$base: #668CB0;
$base-ink: #141310;
$base-50: #F5F7FA;
$base-100: #E4EBF2;
$base-200: #C9D7E3;
$base-300: #A3B8CC;
$base-400: #7F9AB3;
$base-500: #5E7B97;
$base-600: #4D6275;
$base-700: #3A4854;
$base-800: #293138;
$base-900: #1A1F23;
$base-hover: #4C7194;
$base-subtle: #D4DDE5;

{
    "color": {
        "base": {
            "value": "#668CB0",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E4EBF2",
                "type": "color"
            },
            "200": {
                "value": "#C9D7E3",
                "type": "color"
            },
            "300": {
                "value": "#A3B8CC",
                "type": "color"
            },
            "400": {
                "value": "#7F9AB3",
                "type": "color"
            },
            "500": {
                "value": "#5E7B97",
                "type": "color"
            },
            "600": {
                "value": "#4D6275",
                "type": "color"
            },
            "700": {
                "value": "#3A4854",
                "type": "color"
            },
            "800": {
                "value": "#293138",
                "type": "color"
            },
            "900": {
                "value": "#1A1F23",
                "type": "color"
            }
        }
    }
}

Palettes built on #668CB0

Color Lab

Pairs with #668CB0

UI roles & guardrails

In real applications

Scales

Every model

Export