What color is #166ACA?

#166ACA is a medium, vivid blue. In RGB it is rgb(22, 106, 202), and in HSL hsl(212, 80%, 44%).

Is #166ACA accessible as text?

On white, #166ACA has a contrast ratio of 5.32:1 (passes WCAG AA for body text); on black it is 3.95:1 (fails). For text placed on #166ACA, use white for the best readability.

What is the closest Tailwind color to #166ACA?

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

What colors go well with #166ACA?

#166ACA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CA7616. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #166ACA below.

Is #166ACA good for buttons?

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

Is #166ACA the same as CSS royalblue?

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

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

Palettes built on #166ACA

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

Coastal Morning Lead · 5 colors

Lead #166ACA 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 #166ACA Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4C90E9

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 #166ACA 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 #166ACA 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 #166ACA Secondary #7E98BA 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.

Build a working theme in the generator →

Color Lab

How #166ACA 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 5/100

Cool

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

Softness 37/100

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 51/100

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 66/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #166ACA

For UI

For branding

For interior

For fashion

People also use #166ACA 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 #D2E1F3 for cards and hover fills. Tint 80

Avoid beside #162ECA — 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 #166ACA 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
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Packaging

BLOOM

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250 ml

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Export

:root {
  --color-base: #166ACA;
  --color-base-rgb: 22 106 202;
  --color-base-oklch: oklch(53.2% 0.167 255.8);
  --color-50: #F1F7FE;
  --color-100: #D9E9FC;
  --color-200: #B6D4F7;
  --color-300: #84B4EB;
  --color-400: #5795DB;
  --color-500: #3476C1;
  --color-600: #2F5E93;
  --color-700: #274568;
  --color-800: #1D2F44;
  --color-900: #141E29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  true-blue: {
    50: '#F1F7FE',
    100: '#D9E9FC',
    200: '#B6D4F7',
    300: '#84B4EB',
    400: '#5795DB',
    500: '#3476C1',
    600: '#2F5E93',
    700: '#274568',
    800: '#1D2F44',
    900: '#141E29',
  },
}

$base: #166ACA;
$base-ink: #FFFFFF;
$base-50: #F1F7FE;
$base-100: #D9E9FC;
$base-200: #B6D4F7;
$base-300: #84B4EB;
$base-400: #5795DB;
$base-500: #3476C1;
$base-600: #2F5E93;
$base-700: #274568;
$base-800: #1D2F44;
$base-900: #141E29;
$base-hover: #1255A2;
$base-subtle: #BAD2EE;

{
    "color": {
        "base": {
            "value": "#166ACA",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F7FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E9FC",
                "type": "color"
            },
            "200": {
                "value": "#B6D4F7",
                "type": "color"
            },
            "300": {
                "value": "#84B4EB",
                "type": "color"
            },
            "400": {
                "value": "#5795DB",
                "type": "color"
            },
            "500": {
                "value": "#3476C1",
                "type": "color"
            },
            "600": {
                "value": "#2F5E93",
                "type": "color"
            },
            "700": {
                "value": "#274568",
                "type": "color"
            },
            "800": {
                "value": "#1D2F44",
                "type": "color"
            },
            "900": {
                "value": "#141E29",
                "type": "color"
            }
        }
    }
}

Palettes built on #166ACA

Color Lab

Pairs with #166ACA

UI roles & guardrails

In real applications

Scales

Every model

Export