What color is #377EAA?

#377EAA is a medium cyan-blue. In RGB it is rgb(55, 126, 170), and in HSL hsl(203, 51%, 44%).

Is #377EAA accessible as text?

On white, #377EAA has a contrast ratio of 4.44:1 (fails WCAG AA for body text); on black it is 4.73:1 (passes). For text placed on #377EAA, use black for the best readability.

What is the closest Tailwind color to #377EAA?

The nearest Tailwind CSS token is cyan-700 (#007595).

What colors go well with #377EAA?

#377EAA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A96337. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #377EAA below.

Is #377EAA good for buttons?

#377EAA works well for buttons and highlights, but use black text on #377EAA — white text only reaches 4.44:1, below the 4.5:1 needed for normal-size labels.

Is #377EAA the same as CSS steelblue?

No — #377EAA is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#377EAA Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #377EAA

Not just a swatch — here's how #377EAA works with other colors. Named schemes with #377EAA in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #377EAA Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Steel 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 #377EAA Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #65A2CB

Steel 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 Steel Blue.

Vintage Leather Lead · 5 colors

Lead #377EAA Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

Steel 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 #377EAA Surface #EEE9D6 Anchor #592246 Accent #E4C2CC Secondary #322B30

Steel 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 #377EAA Secondary #8EA4B4 Support #969386 Ink #16140F

Steel 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 Steel Blue carrying the quiet middle.

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Color Lab

How #377EAA 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 21/100

Cool

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

Softness 48/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 43/100

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 56/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 50/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 27/100

Low

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

UI accent fit 91/100

Very high

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

Surface fit 29/100

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 #377EAA

For UI

For branding

For interior

For fashion

People also use #377EAA with

Medium Aquamarine Cobalt Blue Ginger Platinum 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 white text at 4.4:1. Use

Subtle surface Use #D8E5ED for cards and hover fills. Tint 80

Avoid beside #3757A9 — 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 #377EAA 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: #377EAA;
  --color-base-rgb: 55 126 170;
  --color-base-oklch: oklch(56.7% 0.098 239.1);
  --color-50: #F3F8FC;
  --color-100: #E0EDF6;
  --color-200: #C1DBEB;
  --color-300: #97BFD9;
  --color-400: #6FA3C3;
  --color-500: #4E85A7;
  --color-600: #416881;
  --color-700: #334C5C;
  --color-800: #24333D;
  --color-900: #182026;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F3F8FC',
    100: '#E0EDF6',
    200: '#C1DBEB',
    300: '#97BFD9',
    400: '#6FA3C3',
    500: '#4E85A7',
    600: '#416881',
    700: '#334C5C',
    800: '#24333D',
    900: '#182026',
  },
}

$base: #377EAA;
$base-ink: #141310;
$base-50: #F3F8FC;
$base-100: #E0EDF6;
$base-200: #C1DBEB;
$base-300: #97BFD9;
$base-400: #6FA3C3;
$base-500: #4E85A7;
$base-600: #416881;
$base-700: #334C5C;
$base-800: #24333D;
$base-900: #182026;
$base-hover: #2C6488;
$base-subtle: #C4D8E5;

{
    "color": {
        "base": {
            "value": "#377EAA",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#E0EDF6",
                "type": "color"
            },
            "200": {
                "value": "#C1DBEB",
                "type": "color"
            },
            "300": {
                "value": "#97BFD9",
                "type": "color"
            },
            "400": {
                "value": "#6FA3C3",
                "type": "color"
            },
            "500": {
                "value": "#4E85A7",
                "type": "color"
            },
            "600": {
                "value": "#416881",
                "type": "color"
            },
            "700": {
                "value": "#334C5C",
                "type": "color"
            },
            "800": {
                "value": "#24333D",
                "type": "color"
            },
            "900": {
                "value": "#182026",
                "type": "color"
            }
        }
    }
}

Palettes built on #377EAA

Color Lab

Pairs with #377EAA

UI roles & guardrails

In real applications

Scales

Every model

Export