What color is #557BCB?

#557BCB is a medium blue. In RGB it is rgb(85, 123, 203), and in HSL hsl(221, 53%, 56%).

Is #557BCB accessible as text?

On white, #557BCB has a contrast ratio of 4.13:1 (fails WCAG AA for body text); on black it is 5.08:1 (passes). For text placed on #557BCB, use black for the best readability.

What is the closest Tailwind color to #557BCB?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #557BCB?

#557BCB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CAA553. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #557BCB below.

Is #557BCB good for buttons?

#557BCB works well for buttons and highlights, but use black text on #557BCB — white text only reaches 4.13:1, below the 4.5:1 needed for normal-size labels.

Is #557BCB the same as CSS steelblue?

No — #557BCB is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#557BCB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #557BCB

Not just a swatch — here's how #557BCB works with other colors. Named schemes with #557BCB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #557BCB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Glaucous 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 #557BCB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #7CA1EC

Glaucous is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Glaucous.

Vintage Leather Lead · 5 colors

Lead #557BCB Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Glaucous 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 #557BCB Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #557BCB Secondary #9AA9C6 Support #9D8F88 Ink #18140F

Glaucous 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 Glaucous carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #557BCB 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 18/100

Cool

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

Softness 46/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 42/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 46/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 48/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 35/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 93/100

Very high

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

Surface fit 22/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #557BCB

For UI

For branding

For interior

For fashion

People also use #557BCB with

Lagoon Blue Slate Blue Brass Gainsboro Charcoal

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

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 4.5:1. Use

Subtle surface Use #E0E5F1 for cards and hover fills. Tint 80

Avoid beside #5553CA — 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 #557BCB 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: #557BCB;
  --color-base-rgb: 85 123 203;
  --color-base-oklch: oklch(59.2% 0.130 263.7);
  --color-50: #F3F6FC;
  --color-100: #DFE6F6;
  --color-200: #C1CEEC;
  --color-300: #95ABDA;
  --color-400: #6D89C5;
  --color-500: #4C69A9;
  --color-600: #405582;
  --color-700: #32405D;
  --color-800: #242C3D;
  --color-900: #171C26;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  glaucous: {
    50: '#F3F6FC',
    100: '#DFE6F6',
    200: '#C1CEEC',
    300: '#95ABDA',
    400: '#6D89C5',
    500: '#4C69A9',
    600: '#405582',
    700: '#32405D',
    800: '#242C3D',
    900: '#171C26',
  },
}

$base: #557BCB;
$base-ink: #141310;
$base-50: #F3F6FC;
$base-100: #DFE6F6;
$base-200: #C1CEEC;
$base-300: #95ABDA;
$base-400: #6D89C5;
$base-500: #4C69A9;
$base-600: #405582;
$base-700: #32405D;
$base-800: #242C3D;
$base-900: #171C26;
$base-hover: #365CAF;
$base-subtle: #D0D8EB;

{
    "color": {
        "base": {
            "value": "#557BCB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE6F6",
                "type": "color"
            },
            "200": {
                "value": "#C1CEEC",
                "type": "color"
            },
            "300": {
                "value": "#95ABDA",
                "type": "color"
            },
            "400": {
                "value": "#6D89C5",
                "type": "color"
            },
            "500": {
                "value": "#4C69A9",
                "type": "color"
            },
            "600": {
                "value": "#405582",
                "type": "color"
            },
            "700": {
                "value": "#32405D",
                "type": "color"
            },
            "800": {
                "value": "#242C3D",
                "type": "color"
            },
            "900": {
                "value": "#171C26",
                "type": "color"
            }
        }
    }
}

Palettes built on #557BCB

Color Lab

Pairs with #557BCB

UI roles & guardrails

In real applications

Scales

Every model

Export