What color is #669BB2?

#669BB2 is a medium, muted cyan-blue. In RGB it is rgb(102, 155, 178), and in HSL hsl(198, 33%, 55%).

Is #669BB2 accessible as text?

On white, #669BB2 has a contrast ratio of 3.05:1 (fails WCAG AA for body text); on black it is 6.90:1 (passes). For text placed on #669BB2, use black for the best readability.

What is the closest Tailwind color to #669BB2?

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

What colors go well with #669BB2?

#669BB2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B27D66. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #669BB2 below.

Is #669BB2 good for buttons?

#669BB2 works well for buttons and highlights, but use black text on #669BB2 — white text only reaches 3.05:1, below the 4.5:1 needed for normal-size labels.

Is #669BB2 the same as CSS cadetblue?

No — #669BB2 is not the CSS named color cadetblue, but cadetblue (#5F9EA0) is the closest CSS named color.

#669BB2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #669BB2

Not just a swatch — here's how #669BB2 works with other colors. Named schemes with #669BB2 in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #669BB2 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 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.

Coastal Morning Lead · 5 colors

Lead #669BB2 Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Cadet 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 #669BB2 Surface #ECEADC Highlight #F4F2E7 Secondary #B3B19F 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.

Tech Product Signal · 5 colors

Signal #669BB2 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #90C0D5

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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #669BB2 Secondary #AFC1CA Support #969386 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.

Build a working theme in the generator →

Color Lab

How #669BB2 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 60/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 33/100

Low

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

Naturalness 1/100

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

Low

Understated — leans refined without going austere.

Brand distinctiveness 25/100

Low

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

UI accent fit 59/100

Moderate

Workable accent with care around contrast.

Surface fit 48/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #669BB2

For UI

For branding

For interior

For fashion

People also use #669BB2 with

Dark Sea Green Very Peri Beaver 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 #E3EAEE for cards and hover fills. Tint 80

Avoid beside #6682B2 — 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 #669BB2 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: #669BB2;
  --color-base-rgb: 102 155 178;
  --color-base-oklch: oklch(66.1% 0.066 227.2);
  --color-50: #F5F8FA;
  --color-100: #E3EDF2;
  --color-200: #C9DCE4;
  --color-300: #A2C0CD;
  --color-400: #7EA4B4;
  --color-500: #5D8697;
  --color-600: #4C6975;
  --color-700: #3A4D55;
  --color-800: #293438;
  --color-900: #1A2023;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  cadet-blue: {
    50: '#F5F8FA',
    100: '#E3EDF2',
    200: '#C9DCE4',
    300: '#A2C0CD',
    400: '#7EA4B4',
    500: '#5D8697',
    600: '#4C6975',
    700: '#3A4D55',
    800: '#293438',
    900: '#1A2023',
  },
}

$base: #669BB2;
$base-ink: #141310;
$base-50: #F5F8FA;
$base-100: #E3EDF2;
$base-200: #C9DCE4;
$base-300: #A2C0CD;
$base-400: #7EA4B4;
$base-500: #5D8697;
$base-600: #4C6975;
$base-700: #3A4D55;
$base-800: #293438;
$base-900: #1A2023;
$base-hover: #4B7F95;
$base-subtle: #D4E0E5;

{
    "color": {
        "base": {
            "value": "#669BB2",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F8FA",
                "type": "color"
            },
            "100": {
                "value": "#E3EDF2",
                "type": "color"
            },
            "200": {
                "value": "#C9DCE4",
                "type": "color"
            },
            "300": {
                "value": "#A2C0CD",
                "type": "color"
            },
            "400": {
                "value": "#7EA4B4",
                "type": "color"
            },
            "500": {
                "value": "#5D8697",
                "type": "color"
            },
            "600": {
                "value": "#4C6975",
                "type": "color"
            },
            "700": {
                "value": "#3A4D55",
                "type": "color"
            },
            "800": {
                "value": "#293438",
                "type": "color"
            },
            "900": {
                "value": "#1A2023",
                "type": "color"
            }
        }
    }
}

Palettes built on #669BB2

Color Lab

Pairs with #669BB2

UI roles & guardrails

In real applications

Scales

Every model

Export