What color is #669999?

#669999 is a medium, muted cyan. In RGB it is rgb(102, 153, 153), and in HSL hsl(180, 20%, 50%).

Is #669999 accessible as text?

On white, #669999 has a contrast ratio of 3.19:1 (fails WCAG AA for body text); on black it is 6.58:1 (passes). For text placed on #669999, use black for the best readability.

What is the closest Tailwind color to #669999?

The nearest Tailwind CSS token is teal-600 (#009689).

What colors go well with #669999?

#669999 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #996666. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #669999 below.

Is #669999 good for buttons?

#669999 works well for buttons and highlights, but use black text on #669999 — white text only reaches 3.19:1, below the 4.5:1 needed for normal-size labels.

Is #669999 the same as CSS cadetblue?

No — #669999 is not the CSS named color cadetblue, but cadetblue (#5F9EA0) is the closest CSS named color.

#669999 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #669999

Not just a swatch — here's how #669999 works with other colors. Named schemes with #669999 in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #669999 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A4 Anchor #2E3236

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

Japanese Sand Base · 5 colors

Base #669999 Surface #EDEADC Highlight #F5F2E7 Secondary #B4B19F Ink #2A2723

Cadet 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.

Coastal Morning Lead · 5 colors

Lead #669999 Accent #A6C4BD Surface #E0DABE Secondary #9AA0A0 Anchor #1D3549

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #669999 Secondary #ACBEBD Support #979286 Ink #16140F

Cadet 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 Cadet Blue carrying the quiet middle.

Tech Product Signal · 5 colors

Signal #669999 Surface #14161A Highlight #F4F6F8 Secondary #596771 Accent #8FBEBD

Cadet 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 Cadet Blue.

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Color Lab

How #669999 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 37/100

Cool

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

Softness 60/100

High

Middle-weight — neither delicate nor heavy.

Depth 34/100

Low

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

Naturalness 10/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 40/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 21/100

Low

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

UI accent fit 58/100

Moderate

Workable accent with care around contrast.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 86/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #669999

For UI

For branding

For interior

For fashion

People also use #669999 with

Sage Slate Gray Mauve Taupe Platinum Dark Slate Gray

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 5.8:1. Use

Subtle surface Use #E2E9E9 for cards and hover fills. Tint 80

Avoid beside #668899 — 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 #669999 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: #669999;
  --color-base-rgb: 102 153 153;
  --color-base-oklch: oklch(64.7% 0.054 195.9);
  --color-50: #F6F9F9;
  --color-100: #E6EFEF;
  --color-200: #CEDEDE;
  --color-300: #ABC5C5;
  --color-400: #88AAAA;
  --color-500: #698C8C;
  --color-600: #546D6D;
  --color-700: #3F4F4F;
  --color-800: #2C3535;
  --color-900: #1C2121;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  cadet-blue: {
    50: '#F6F9F9',
    100: '#E6EFEF',
    200: '#CEDEDE',
    300: '#ABC5C5',
    400: '#88AAAA',
    500: '#698C8C',
    600: '#546D6D',
    700: '#3F4F4F',
    800: '#2C3535',
    900: '#1C2121',
  },
}

$base: #669999;
$base-ink: #141310;
$base-50: #F6F9F9;
$base-100: #E6EFEF;
$base-200: #CEDEDE;
$base-300: #ABC5C5;
$base-400: #88AAAA;
$base-500: #698C8C;
$base-600: #546D6D;
$base-700: #3F4F4F;
$base-800: #2C3535;
$base-900: #1C2121;
$base-hover: #527A7A;
$base-subtle: #D3DFDF;

{
    "color": {
        "base": {
            "value": "#669999",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F9F9",
                "type": "color"
            },
            "100": {
                "value": "#E6EFEF",
                "type": "color"
            },
            "200": {
                "value": "#CEDEDE",
                "type": "color"
            },
            "300": {
                "value": "#ABC5C5",
                "type": "color"
            },
            "400": {
                "value": "#88AAAA",
                "type": "color"
            },
            "500": {
                "value": "#698C8C",
                "type": "color"
            },
            "600": {
                "value": "#546D6D",
                "type": "color"
            },
            "700": {
                "value": "#3F4F4F",
                "type": "color"
            },
            "800": {
                "value": "#2C3535",
                "type": "color"
            },
            "900": {
                "value": "#1C2121",
                "type": "color"
            }
        }
    }
}

Palettes built on #669999

Color Lab

Pairs with #669999

UI roles & guardrails

In real applications

Scales

Every model

Export