What color is #166FAE?

#166FAE is a dark, vivid cyan-blue. In RGB it is rgb(22, 111, 174), and in HSL hsl(205, 78%, 38%).

Is #166FAE accessible as text?

On white, #166FAE has a contrast ratio of 5.36:1 (passes WCAG AA for body text); on black it is 3.92:1 (fails). For text placed on #166FAE, use white for the best readability.

What is the closest Tailwind color to #166FAE?

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

What colors go well with #166FAE?

#166FAE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AC5415. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #166FAE below.

Is #166FAE good for buttons?

#166FAE works well for buttons and highlights, but use white text on #166FAE — black text only reaches 3.92:1, below the 4.5:1 needed for normal-size labels.

Is #166FAE the same as CSS steelblue?

No — #166FAE is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

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

Palettes built on #166FAE

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

Coastal Morning Lead · 5 colors

Lead #166FAE Accent #A5C4C0 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 #166FAE Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4D94CE

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 #166FAE Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

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 #166FAE Surface #EDE9D6 Anchor #5A2246 Accent #E4C2CB 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 #166FAE Secondary #7E97AE Support #969386 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 #166FAE 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 14/100

Cool

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

Softness 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 48/100

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 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 34/100

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 16/100

Very low

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

Print safety 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #166FAE

For UI

For branding

For interior

For fashion

People also use #166FAE with

Medium Aquamarine Zaffre Sienna 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 5.4:1. Use

Subtle surface Use #CEE2F1 for cards and hover fills. Tint 80

Avoid beside #153BAC — 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 #166FAE 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: #166FAE;
  --color-base-rgb: 22 111 174;
  --color-base-oklch: oklch(52.5% 0.126 246.1);
  --color-50: #F1F8FE;
  --color-100: #DAEDFB;
  --color-200: #B6DBF6;
  --color-300: #85C0EA;
  --color-400: #58A4DA;
  --color-500: #3686BF;
  --color-600: #306991;
  --color-700: #284D67;
  --color-800: #1E3443;
  --color-900: #142029;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  lapis-lazuli: {
    50: '#F1F8FE',
    100: '#DAEDFB',
    200: '#B6DBF6',
    300: '#85C0EA',
    400: '#58A4DA',
    500: '#3686BF',
    600: '#306991',
    700: '#284D67',
    800: '#1E3443',
    900: '#142029',
  },
}

$base: #166FAE;
$base-ink: #FFFFFF;
$base-50: #F1F8FE;
$base-100: #DAEDFB;
$base-200: #B6DBF6;
$base-300: #85C0EA;
$base-400: #58A4DA;
$base-500: #3686BF;
$base-600: #306991;
$base-700: #284D67;
$base-800: #1E3443;
$base-900: #142029;
$base-hover: #11588A;
$base-subtle: #B3D4EC;

{
    "color": {
        "base": {
            "value": "#166FAE",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F8FE",
                "type": "color"
            },
            "100": {
                "value": "#DAEDFB",
                "type": "color"
            },
            "200": {
                "value": "#B6DBF6",
                "type": "color"
            },
            "300": {
                "value": "#85C0EA",
                "type": "color"
            },
            "400": {
                "value": "#58A4DA",
                "type": "color"
            },
            "500": {
                "value": "#3686BF",
                "type": "color"
            },
            "600": {
                "value": "#306991",
                "type": "color"
            },
            "700": {
                "value": "#284D67",
                "type": "color"
            },
            "800": {
                "value": "#1E3443",
                "type": "color"
            },
            "900": {
                "value": "#142029",
                "type": "color"
            }
        }
    }
}

Palettes built on #166FAE

Color Lab

Pairs with #166FAE

UI roles & guardrails

In real applications

Scales

Every model

Export