What color is #3166AF?

#3166AF is a medium blue. In RGB it is rgb(49, 102, 175), and in HSL hsl(215, 56%, 44%).

Is #3166AF accessible as text?

On white, #3166AF has a contrast ratio of 5.75:1 (passes WCAG AA for body text); on black it is 3.65:1 (fails). For text placed on #3166AF, use white for the best readability.

What is the closest Tailwind color to #3166AF?

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

What colors go well with #3166AF?

#3166AF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AF7B31. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3166AF below.

Is #3166AF good for buttons?

#3166AF works well for buttons and highlights, but use white text on #3166AF — black text only reaches 3.65:1, below the 4.5:1 needed for normal-size labels.

Is #3166AF the same as CSS royalblue?

No — #3166AF is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#3166AF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3166AF

Not just a swatch — here's how #3166AF works with other colors. Named schemes with #3166AF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3166AF Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Lapis Lazuli 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 #3166AF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5A8BCF

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

Vintage Leather Lead · 5 colors

Lead #3166AF Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223B

Lapis Lazuli 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 #3166AF Surface #EDE9D6 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Lapis Lazuli 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 #3166AF Secondary #7E91AC Support #9D8F89 Ink #16140F

Lapis Lazuli 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 Lapis Lazuli carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #3166AF 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 16/100

Cool

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

Softness 40/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 50/100

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 55/100

Moderate

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 35/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 99/100

Very high

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

Surface fit 14/100

Very low

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

Print safety 74/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3166AF

For UI

For branding

For interior

For fashion

People also use #3166AF with

Robin Egg Blue Egyptian Blue Copper 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 5.8:1. Use

Subtle surface Use #D7E1EE for cards and hover fills. Tint 80

Avoid beside #313CAF — 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 #3166AF 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: #3166AF;
  --color-base-rgb: 49 102 175;
  --color-base-oklch: oklch(51.2% 0.129 257.1);
  --color-50: #F3F7FC;
  --color-100: #DFE9F7;
  --color-200: #BFD2ED;
  --color-300: #93B2DC;
  --color-400: #6B91C7;
  --color-500: #4972AC;
  --color-600: #3E5B84;
  --color-700: #31445E;
  --color-800: #232E3E;
  --color-900: #171D26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  lapis-lazuli: {
    50: '#F3F7FC',
    100: '#DFE9F7',
    200: '#BFD2ED',
    300: '#93B2DC',
    400: '#6B91C7',
    500: '#4972AC',
    600: '#3E5B84',
    700: '#31445E',
    800: '#232E3E',
    900: '#171D26',
  },
}

$base: #3166AF;
$base-ink: #FFFFFF;
$base-50: #F3F7FC;
$base-100: #DFE9F7;
$base-200: #BFD2ED;
$base-300: #93B2DC;
$base-400: #6B91C7;
$base-500: #4972AC;
$base-600: #3E5B84;
$base-700: #31445E;
$base-800: #232E3E;
$base-900: #171D26;
$base-hover: #27518C;
$base-subtle: #C2D1E6;

{
    "color": {
        "base": {
            "value": "#3166AF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F7FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE9F7",
                "type": "color"
            },
            "200": {
                "value": "#BFD2ED",
                "type": "color"
            },
            "300": {
                "value": "#93B2DC",
                "type": "color"
            },
            "400": {
                "value": "#6B91C7",
                "type": "color"
            },
            "500": {
                "value": "#4972AC",
                "type": "color"
            },
            "600": {
                "value": "#3E5B84",
                "type": "color"
            },
            "700": {
                "value": "#31445E",
                "type": "color"
            },
            "800": {
                "value": "#232E3E",
                "type": "color"
            },
            "900": {
                "value": "#171D26",
                "type": "color"
            }
        }
    }
}

Palettes built on #3166AF

Color Lab

Pairs with #3166AF

UI roles & guardrails

In real applications

Scales

Every model

Export