What color is #1663B1?

#1663B1 is a dark, vivid blue. In RGB it is rgb(22, 99, 177), and in HSL hsl(210, 78%, 39%).

Is #1663B1 accessible as text?

On white, #1663B1 has a contrast ratio of 6.08:1 (passes WCAG AA for body text); on black it is 3.45:1 (fails). For text placed on #1663B1, use white for the best readability.

What is the closest Tailwind color to #1663B1?

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

What colors go well with #1663B1?

#1663B1 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B16316. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1663B1 below.

Is #1663B1 good for buttons?

#1663B1 works well for buttons and highlights, but use white text on #1663B1 — black text only reaches 3.45:1, below the 4.5:1 needed for normal-size labels.

Is #1663B1 the same as CSS royalblue?

No — #1663B1 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#1663B1 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1663B1

Not just a swatch — here's how #1663B1 works with other colors. Named schemes with #1663B1 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1663B1 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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 #1663B1 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4988D1

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 #1663B1 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

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 #1663B1 Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB 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 #F6F4EF Accent #1663B1 Secondary #778EAA Support #9D8F89 Ink #16140F

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 #1663B1 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 11/100

Cool

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 52/100

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 40/100

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 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 98/100

Very high

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

Surface fit 9/100

Very low

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

Print safety 70/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #1663B1

For UI

For branding

For interior

For fashion

People also use #1663B1 with

Medium Turquoise Zaffre Ginger 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 6.1:1. Use

Subtle surface Use #CEE0F1 for cards and hover fills. Tint 80

Avoid beside #1630B1 — 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 #1663B1 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: #1663B1;
  --color-base-rgb: 22 99 177;
  --color-base-oklch: oklch(49.8% 0.143 253.4);
  --color-50: #F1F7FE;
  --color-100: #DAEBFB;
  --color-200: #B6D6F6;
  --color-300: #85B8EA;
  --color-400: #5899DA;
  --color-500: #367ABF;
  --color-600: #306191;
  --color-700: #284767;
  --color-800: #1E3043;
  --color-900: #141F29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  denim-blue: {
    50: '#F1F7FE',
    100: '#DAEBFB',
    200: '#B6D6F6',
    300: '#85B8EA',
    400: '#5899DA',
    500: '#367ABF',
    600: '#306191',
    700: '#284767',
    800: '#1E3043',
    900: '#141F29',
  },
}

$base: #1663B1;
$base-ink: #FFFFFF;
$base-50: #F1F7FE;
$base-100: #DAEBFB;
$base-200: #B6D6F6;
$base-300: #85B8EA;
$base-400: #5899DA;
$base-500: #367ABF;
$base-600: #306191;
$base-700: #284767;
$base-800: #1E3043;
$base-900: #141F29;
$base-hover: #12508E;
$base-subtle: #B5D0EC;

{
    "color": {
        "base": {
            "value": "#1663B1",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F7FE",
                "type": "color"
            },
            "100": {
                "value": "#DAEBFB",
                "type": "color"
            },
            "200": {
                "value": "#B6D6F6",
                "type": "color"
            },
            "300": {
                "value": "#85B8EA",
                "type": "color"
            },
            "400": {
                "value": "#5899DA",
                "type": "color"
            },
            "500": {
                "value": "#367ABF",
                "type": "color"
            },
            "600": {
                "value": "#306191",
                "type": "color"
            },
            "700": {
                "value": "#284767",
                "type": "color"
            },
            "800": {
                "value": "#1E3043",
                "type": "color"
            },
            "900": {
                "value": "#141F29",
                "type": "color"
            }
        }
    }
}

Palettes built on #1663B1

Color Lab

Pairs with #1663B1

UI roles & guardrails

In real applications

Scales

Every model

Export