What color is #428BB3?

#428BB3 is a medium cyan-blue. In RGB it is rgb(66, 139, 179), and in HSL hsl(201, 46%, 48%).

Is #428BB3 accessible as text?

On white, #428BB3 has a contrast ratio of 3.77:1 (fails WCAG AA for body text); on black it is 5.58:1 (passes). For text placed on #428BB3, use black for the best readability.

What is the closest Tailwind color to #428BB3?

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

What colors go well with #428BB3?

#428BB3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B36A42. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #428BB3 below.

Is #428BB3 good for buttons?

#428BB3 works well for buttons and highlights, but use black text on #428BB3 — white text only reaches 3.77:1, below the 4.5:1 needed for normal-size labels.

Is #428BB3 the same as CSS steelblue?

No — #428BB3 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#428BB3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #428BB3

Not just a swatch — here's how #428BB3 works with other colors. Named schemes with #428BB3 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #428BB3 Accent #A6C4C0 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 #428BB3 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #70B0D5

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 #428BB3 Secondary #6E5216 Surface #E2DCC0 Accent #385245 Anchor #57233D

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 #428BB3 Surface #EEE9D6 Anchor #592247 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 #428BB3 Secondary #9AB1BF 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 #428BB3 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 22/100

Cool

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

Softness 52/100

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 53/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 46/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 26/100

Low

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

UI accent fit 83/100

Very high

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

Surface fit 34/100

Low

Usable as a tinted surface in measured doses.

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #428BB3

For UI

For branding

For interior

For fashion

People also use #428BB3 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 4.9:1. Use

Subtle surface Use #DCE7ED for cards and hover fills. Tint 80

Avoid beside #4266B3 — 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 #428BB3 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: #428BB3;
  --color-base-rgb: 66 139 179;
  --color-base-oklch: oklch(60.7% 0.095 235.3);
  --color-50: #F3F9FB;
  --color-100: #E1EEF5;
  --color-200: #C4DCE9;
  --color-300: #9AC1D5;
  --color-400: #73A4BF;
  --color-500: #5287A3;
  --color-600: #44697E;
  --color-700: #354D5A;
  --color-800: #25343C;
  --color-900: #182025;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  ocean-blue: {
    50: '#F3F9FB',
    100: '#E1EEF5',
    200: '#C4DCE9',
    300: '#9AC1D5',
    400: '#73A4BF',
    500: '#5287A3',
    600: '#44697E',
    700: '#354D5A',
    800: '#25343C',
    900: '#182025',
  },
}

$base: #428BB3;
$base-ink: #141310;
$base-50: #F3F9FB;
$base-100: #E1EEF5;
$base-200: #C4DCE9;
$base-300: #9AC1D5;
$base-400: #73A4BF;
$base-500: #5287A3;
$base-600: #44697E;
$base-700: #354D5A;
$base-800: #25343C;
$base-900: #182025;
$base-hover: #356F8F;
$base-subtle: #C9DBE5;

{
    "color": {
        "base": {
            "value": "#428BB3",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F9FB",
                "type": "color"
            },
            "100": {
                "value": "#E1EEF5",
                "type": "color"
            },
            "200": {
                "value": "#C4DCE9",
                "type": "color"
            },
            "300": {
                "value": "#9AC1D5",
                "type": "color"
            },
            "400": {
                "value": "#73A4BF",
                "type": "color"
            },
            "500": {
                "value": "#5287A3",
                "type": "color"
            },
            "600": {
                "value": "#44697E",
                "type": "color"
            },
            "700": {
                "value": "#354D5A",
                "type": "color"
            },
            "800": {
                "value": "#25343C",
                "type": "color"
            },
            "900": {
                "value": "#182025",
                "type": "color"
            }
        }
    }
}

Palettes built on #428BB3

Color Lab

Pairs with #428BB3

UI roles & guardrails

In real applications

Scales

Every model

Export