What color is #166BC6?

#166BC6 is a medium, vivid blue. In RGB it is rgb(22, 107, 198), and in HSL hsl(211, 80%, 43%).

Is #166BC6 accessible as text?

On white, #166BC6 has a contrast ratio of 5.31:1 (passes WCAG AA for body text); on black it is 3.95:1 (fails). For text placed on #166BC6, use white for the best readability.

What is the closest Tailwind color to #166BC6?

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

What colors go well with #166BC6?

#166BC6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C57116. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #166BC6 below.

Is #166BC6 good for buttons?

#166BC6 works well for buttons and highlights, but use white text on #166BC6 — black text only reaches 3.95:1, below the 4.5:1 needed for normal-size labels.

Is #166BC6 the same as CSS royalblue?

No — #166BC6 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#166BC6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #166BC6

Not just a swatch — here's how #166BC6 works with other colors. Named schemes with #166BC6 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #166BC6 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

True 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 #166BC6 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4C91E5

True 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 True Blue.

Vintage Leather Lead · 5 colors

Lead #166BC6 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

True 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 #166BC6 Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CA Secondary #322B2F

True 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 #166BC6 Secondary #7E98B8 Support #9D8F89 Ink #16140F

True 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 True Blue carrying the quiet middle.

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Color Lab

How #166BC6 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 7/100

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 37/100

Low

A faint retro warmth without tipping into sepia.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 43/100

Moderate

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 10/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #166BC6

For UI

For branding

For interior

For fashion

People also use #166BC6 with

Turquoise Medium 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 5.3:1. Use

Subtle surface Use #D1E1F3 for cards and hover fills. Tint 80

Avoid beside #1630C5 — 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 #166BC6 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: #166BC6;
  --color-base-rgb: 22 107 198;
  --color-base-oklch: oklch(53.1% 0.161 254.7);
  --color-50: #F1F7FE;
  --color-100: #D9EAFC;
  --color-200: #B6D5F7;
  --color-300: #84B6EB;
  --color-400: #5797DB;
  --color-500: #3478C1;
  --color-600: #2F5F93;
  --color-700: #274668;
  --color-800: #1D3044;
  --color-900: #141E29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  true-blue: {
    50: '#F1F7FE',
    100: '#D9EAFC',
    200: '#B6D5F7',
    300: '#84B6EB',
    400: '#5797DB',
    500: '#3478C1',
    600: '#2F5F93',
    700: '#274668',
    800: '#1D3044',
    900: '#141E29',
  },
}

$base: #166BC6;
$base-ink: #FFFFFF;
$base-50: #F1F7FE;
$base-100: #D9EAFC;
$base-200: #B6D5F7;
$base-300: #84B6EB;
$base-400: #5797DB;
$base-500: #3478C1;
$base-600: #2F5F93;
$base-700: #274668;
$base-800: #1D3044;
$base-900: #141E29;
$base-hover: #12559E;
$base-subtle: #B9D3EE;

{
    "color": {
        "base": {
            "value": "#166BC6",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F7FE",
                "type": "color"
            },
            "100": {
                "value": "#D9EAFC",
                "type": "color"
            },
            "200": {
                "value": "#B6D5F7",
                "type": "color"
            },
            "300": {
                "value": "#84B6EB",
                "type": "color"
            },
            "400": {
                "value": "#5797DB",
                "type": "color"
            },
            "500": {
                "value": "#3478C1",
                "type": "color"
            },
            "600": {
                "value": "#2F5F93",
                "type": "color"
            },
            "700": {
                "value": "#274668",
                "type": "color"
            },
            "800": {
                "value": "#1D3044",
                "type": "color"
            },
            "900": {
                "value": "#141E29",
                "type": "color"
            }
        }
    }
}

Palettes built on #166BC6

Color Lab

Pairs with #166BC6

UI roles & guardrails

In real applications

Scales

Every model

Export