What color is #428BBB?

#428BBB is a medium cyan-blue. In RGB it is rgb(66, 139, 187), and in HSL hsl(204, 48%, 50%).

Is #428BBB accessible as text?

On white, #428BBB has a contrast ratio of 3.72:1 (fails WCAG AA for body text); on black it is 5.64:1 (passes). For text placed on #428BBB, use black for the best readability.

What is the closest Tailwind color to #428BBB?

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

What colors go well with #428BBB?

#428BBB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BD7342. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #428BBB below.

Is #428BBB good for buttons?

#428BBB works well for buttons and highlights, but use black text on #428BBB — white text only reaches 3.72:1, below the 4.5:1 needed for normal-size labels.

Is #428BBB the same as CSS steelblue?

No — #428BBB is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#428BBB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #428BBB

Not just a swatch — here's how #428BBB works with other colors. Named schemes with #428BBB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #428BBB Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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

Tech Product Signal · 5 colors

Signal #428BBB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #70B0DD

Ocean 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 Ocean Blue.

Vintage Leather Lead · 5 colors

Lead #428BBB Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

Ocean Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #428BBB Surface #EEE9D6 Anchor #592246 Accent #E4C2CC Secondary #322B30

Ocean Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #428BBB Secondary #9AB2C3 Support #969386 Ink #16140F

Ocean 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 Ocean Blue carrying the quiet middle.

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Color Lab

How #428BBB 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 20/100

Cool

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

Softness 51/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 39/100

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 51/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 28/100

Low

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

UI accent fit 84/100

Very high

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

Surface fit 32/100

Low

Usable as a tinted surface in measured doses.

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #428BBB

For UI

For branding

For interior

For fashion

People also use #428BBB with

Medium Aquamarine Cerulean Copper 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 5.0:1. Use

Subtle surface Use #DDE7EE for cards and hover fills. Tint 80

Avoid beside #4263BD — 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 #428BBB 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: #428BBB;
  --color-base-rgb: 66 139 187;
  --color-base-oklch: oklch(61.1% 0.103 240.2);
  --color-50: #F3F8FB;
  --color-100: #E0EDF5;
  --color-200: #C3DAEA;
  --color-300: #99BED7;
  --color-400: #71A1C1;
  --color-500: #5083A5;
  --color-600: #43677F;
  --color-700: #344B5B;
  --color-800: #25333C;
  --color-900: #182025;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  ocean-blue: {
    50: '#F3F8FB',
    100: '#E0EDF5',
    200: '#C3DAEA',
    300: '#99BED7',
    400: '#71A1C1',
    500: '#5083A5',
    600: '#43677F',
    700: '#344B5B',
    800: '#25333C',
    900: '#182025',
  },
}

$base: #428BBB;
$base-ink: #141310;
$base-50: #F3F8FB;
$base-100: #E0EDF5;
$base-200: #C3DAEA;
$base-300: #99BED7;
$base-400: #71A1C1;
$base-500: #5083A5;
$base-600: #43677F;
$base-700: #344B5B;
$base-800: #25333C;
$base-900: #182025;
$base-hover: #357097;
$base-subtle: #CBDCE7;

{
    "color": {
        "base": {
            "value": "#428BBB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E0EDF5",
                "type": "color"
            },
            "200": {
                "value": "#C3DAEA",
                "type": "color"
            },
            "300": {
                "value": "#99BED7",
                "type": "color"
            },
            "400": {
                "value": "#71A1C1",
                "type": "color"
            },
            "500": {
                "value": "#5083A5",
                "type": "color"
            },
            "600": {
                "value": "#43677F",
                "type": "color"
            },
            "700": {
                "value": "#344B5B",
                "type": "color"
            },
            "800": {
                "value": "#25333C",
                "type": "color"
            },
            "900": {
                "value": "#182025",
                "type": "color"
            }
        }
    }
}

Palettes built on #428BBB

Color Lab

Pairs with #428BBB

UI roles & guardrails

In real applications

Scales

Every model

Export