What color is #3766CD?

#3766CD is a medium blue. In RGB it is rgb(55, 102, 205), and in HSL hsl(221, 60%, 51%).

Is #3766CD accessible as text?

On white, #3766CD has a contrast ratio of 5.32:1 (passes WCAG AA for body text); on black it is 3.94:1 (fails). For text placed on #3766CD, use white for the best readability.

What is the closest Tailwind color to #3766CD?

The nearest Tailwind CSS token is sky-700 (#0069A8).

What colors go well with #3766CD?

#3766CD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CD9E37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3766CD below.

Is #3766CD good for buttons?

#3766CD works well for buttons and highlights, but use white text on #3766CD — black text only reaches 3.94:1, below the 4.5:1 needed for normal-size labels.

Is #3766CD the same as CSS royalblue?

No — #3766CD is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#3766CD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3766CD

Not just a swatch — here's how #3766CD works with other colors. Named schemes with #3766CD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3766CD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Royal 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 #3766CD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5F8DEC

Royal 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 Royal Blue.

Vintage Leather Lead · 5 colors

Lead #3766CD Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Royal 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 #3766CD Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

Royal Blue 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 #3766CD Secondary #8497BC Support #9D8F88 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

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Color Lab

How #3766CD 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 8/100

Cool

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 49/100

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 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 50/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 45/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 97/100

Very high

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

Surface fit 11/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #3766CD

For UI

For branding

For interior

For fashion

People also use #3766CD with

Lagoon Blue Grape Goldenrod Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 5.3:1. Use

Subtle surface Use #DBE2F1 for cards and hover fills. Tint 80

Avoid beside #3A37CD — 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 #3766CD 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: #3766CD;
  --color-base-rgb: 55 102 205;
  --color-base-oklch: oklch(53.5% 0.168 263.4);
  --color-50: #F2F6FC;
  --color-100: #DEE6F8;
  --color-200: #BECDEF;
  --color-300: #91A9DE;
  --color-400: #6787CB;
  --color-500: #4667AF;
  --color-600: #3C5386;
  --color-700: #2F3F60;
  --color-800: #222B3F;
  --color-900: #161C27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F2F6FC',
    100: '#DEE6F8',
    200: '#BECDEF',
    300: '#91A9DE',
    400: '#6787CB',
    500: '#4667AF',
    600: '#3C5386',
    700: '#2F3F60',
    800: '#222B3F',
    900: '#161C27',
  },
}

$base: #3766CD;
$base-ink: #FFFFFF;
$base-50: #F2F6FC;
$base-100: #DEE6F8;
$base-200: #BECDEF;
$base-300: #91A9DE;
$base-400: #6787CB;
$base-500: #4667AF;
$base-600: #3C5386;
$base-700: #2F3F60;
$base-800: #222B3F;
$base-900: #161C27;
$base-hover: #2A51A6;
$base-subtle: #C8D3EB;

{
    "color": {
        "base": {
            "value": "#3766CD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F6FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE6F8",
                "type": "color"
            },
            "200": {
                "value": "#BECDEF",
                "type": "color"
            },
            "300": {
                "value": "#91A9DE",
                "type": "color"
            },
            "400": {
                "value": "#6787CB",
                "type": "color"
            },
            "500": {
                "value": "#4667AF",
                "type": "color"
            },
            "600": {
                "value": "#3C5386",
                "type": "color"
            },
            "700": {
                "value": "#2F3F60",
                "type": "color"
            },
            "800": {
                "value": "#222B3F",
                "type": "color"
            },
            "900": {
                "value": "#161C27",
                "type": "color"
            }
        }
    }
}

Palettes built on #3766CD

Color Lab

Pairs with #3766CD

UI roles & guardrails

In real applications

Scales

Every model

Export