What color is #3966BF?

#3966BF is a medium blue. In RGB it is rgb(57, 102, 191), and in HSL hsl(220, 54%, 49%).

Is #3966BF accessible as text?

On white, #3966BF has a contrast ratio of 5.49:1 (passes WCAG AA for body text); on black it is 3.83:1 (fails). For text placed on #3966BF, use white for the best readability.

What is the closest Tailwind color to #3966BF?

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

What colors go well with #3966BF?

#3966BF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C09339. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3966BF below.

Is #3966BF good for buttons?

#3966BF works well for buttons and highlights, but use white text on #3966BF — black text only reaches 3.83:1, below the 4.5:1 needed for normal-size labels.

Is #3966BF the same as CSS royalblue?

No — #3966BF is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#3966BF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3966BF

Not just a swatch — here's how #3966BF works with other colors. Named schemes with #3966BF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3966BF Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Denim 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 #3966BF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #618CDF

Denim 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 Denim Blue.

Vintage Leather Lead · 5 colors

Lead #3966BF Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Denim 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 #3966BF Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Denim 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 #3966BF Secondary #8395B5 Support #9D8F88 Ink #18140F

Denim 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 Denim Blue carrying the quiet middle.

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Color Lab

How #3966BF 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 13/100

Cool

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

Softness 39/100

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 41/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 40/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 100/100

Very high

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

Surface fit 10/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3966BF

For UI

For branding

For interior

For fashion

People also use #3966BF with

Lagoon Blue Grape Caramel 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 5.5:1. Use

Subtle surface Use #DBE2EF for cards and hover fills. Tint 80

Avoid beside #3939C0 — 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 #3966BF 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: #3966BF;
  --color-base-rgb: 57 102 191;
  --color-base-oklch: oklch(52.6% 0.148 262.3);
  --color-50: #F3F6FC;
  --color-100: #DFE7F6;
  --color-200: #C0CFEC;
  --color-300: #95ACDA;
  --color-400: #6C8AC6;
  --color-500: #4B6BAA;
  --color-600: #3F5683;
  --color-700: #32405D;
  --color-800: #232C3D;
  --color-900: #171C26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  denim-blue: {
    50: '#F3F6FC',
    100: '#DFE7F6',
    200: '#C0CFEC',
    300: '#95ACDA',
    400: '#6C8AC6',
    500: '#4B6BAA',
    600: '#3F5683',
    700: '#32405D',
    800: '#232C3D',
    900: '#171C26',
  },
}

$base: #3966BF;
$base-ink: #FFFFFF;
$base-50: #F3F6FC;
$base-100: #DFE7F6;
$base-200: #C0CFEC;
$base-300: #95ACDA;
$base-400: #6C8AC6;
$base-500: #4B6BAA;
$base-600: #3F5683;
$base-700: #32405D;
$base-800: #232C3D;
$base-900: #171C26;
$base-hover: #2E529A;
$base-subtle: #C8D3E8;

{
    "color": {
        "base": {
            "value": "#3966BF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE7F6",
                "type": "color"
            },
            "200": {
                "value": "#C0CFEC",
                "type": "color"
            },
            "300": {
                "value": "#95ACDA",
                "type": "color"
            },
            "400": {
                "value": "#6C8AC6",
                "type": "color"
            },
            "500": {
                "value": "#4B6BAA",
                "type": "color"
            },
            "600": {
                "value": "#3F5683",
                "type": "color"
            },
            "700": {
                "value": "#32405D",
                "type": "color"
            },
            "800": {
                "value": "#232C3D",
                "type": "color"
            },
            "900": {
                "value": "#171C26",
                "type": "color"
            }
        }
    }
}

Palettes built on #3966BF

Color Lab

Pairs with #3966BF

UI roles & guardrails

In real applications

Scales

Every model

Export