What color is #3780CD?

#3780CD is a medium blue. In RGB it is rgb(55, 128, 205), and in HSL hsl(211, 60%, 51%).

Is #3780CD accessible as text?

On white, #3780CD has a contrast ratio of 4.09:1 (fails WCAG AA for body text); on black it is 5.13:1 (passes). For text placed on #3780CD, use black for the best readability.

What is the closest Tailwind color to #3780CD?

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

What colors go well with #3780CD?

#3780CD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CD8537. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3780CD below.

Is #3780CD good for buttons?

#3780CD works well for buttons and highlights, but use black text on #3780CD — white text only reaches 4.09:1, below the 4.5:1 needed for normal-size labels.

Is #3780CD the same as CSS steelblue?

No — #3780CD is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#3780CD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3780CD

Not just a swatch — here's how #3780CD works with other colors. Named schemes with #3780CD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3780CD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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 #3780CD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #65A6ED

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 #3780CD Secondary #7F4537 Surface #E1DDC0 Accent #375245 Anchor #57233B

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 #3780CD Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB Secondary #322B2F

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 #3780CD Secondary #93ABC6 Support #959386 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.

Build a working theme in the generator →

Color Lab

How #3780CD 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 12/100

Cool

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

Softness 45/100

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 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 94/100

Very high

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

Surface fit 19/100

Very low

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

Print safety 70/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3780CD

For UI

For branding

For interior

For fashion

People also use #3780CD with

Medium Turquoise Cerulean Peru Gainsboro 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 4.5:1. Use

Subtle surface Use #DBE6F1 for cards and hover fills. Tint 80

Avoid beside #374ECD — 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 #3780CD 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: #3780CD;
  --color-base-rgb: 55 128 205;
  --color-base-oklch: oklch(59.1% 0.139 252.3);
  --color-50: #F2F7FC;
  --color-100: #DEEAF8;
  --color-200: #BED5EF;
  --color-300: #91B6DE;
  --color-400: #6797CB;
  --color-500: #4679AF;
  --color-600: #3C6086;
  --color-700: #2F4760;
  --color-800: #22303F;
  --color-900: #161E27;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F2F7FC',
    100: '#DEEAF8',
    200: '#BED5EF',
    300: '#91B6DE',
    400: '#6797CB',
    500: '#4679AF',
    600: '#3C6086',
    700: '#2F4760',
    800: '#22303F',
    900: '#161E27',
  },
}

$base: #3780CD;
$base-ink: #141310;
$base-50: #F2F7FC;
$base-100: #DEEAF8;
$base-200: #BED5EF;
$base-300: #91B6DE;
$base-400: #6797CB;
$base-500: #4679AF;
$base-600: #3C6086;
$base-700: #2F4760;
$base-800: #22303F;
$base-900: #161E27;
$base-hover: #2A66A6;
$base-subtle: #C8D9EB;

{
    "color": {
        "base": {
            "value": "#3780CD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FC",
                "type": "color"
            },
            "100": {
                "value": "#DEEAF8",
                "type": "color"
            },
            "200": {
                "value": "#BED5EF",
                "type": "color"
            },
            "300": {
                "value": "#91B6DE",
                "type": "color"
            },
            "400": {
                "value": "#6797CB",
                "type": "color"
            },
            "500": {
                "value": "#4679AF",
                "type": "color"
            },
            "600": {
                "value": "#3C6086",
                "type": "color"
            },
            "700": {
                "value": "#2F4760",
                "type": "color"
            },
            "800": {
                "value": "#22303F",
                "type": "color"
            },
            "900": {
                "value": "#161E27",
                "type": "color"
            }
        }
    }
}

Palettes built on #3780CD

Color Lab

Pairs with #3780CD

UI roles & guardrails

In real applications

Scales

Every model

Export