What color is #166FC3?

#166FC3 is a medium, vivid blue. In RGB it is rgb(22, 111, 195), and in HSL hsl(209, 80%, 43%).

Is #166FC3 accessible as text?

On white, #166FC3 has a contrast ratio of 5.13:1 (passes WCAG AA for body text); on black it is 4.10:1 (fails). For text placed on #166FC3, use white for the best readability.

What is the closest Tailwind color to #166FC3?

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

What colors go well with #166FC3?

#166FC3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C56B16. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #166FC3 below.

Is #166FC3 good for buttons?

#166FC3 works well for buttons and highlights, but use white text on #166FC3 — black text only reaches 4.10:1, below the 4.5:1 needed for normal-size labels.

Is #166FC3 the same as CSS royalblue?

No — #166FC3 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#166FC3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #166FC3

Not just a swatch — here's how #166FC3 works with other colors. Named schemes with #166FC3 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #166FC3 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 #166FC3 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4D95E3

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 #166FC3 Secondary #7F4537 Surface #E1DDC0 Accent #375245 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 #166FC3 Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB 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 #166FC3 Secondary #809AB8 Support #959386 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 #166FC3 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 8/100

Cool

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

Softness 40/100

Low

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 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 41/100

Moderate

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 11/100

Very low

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

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #166FC3

For UI

For branding

For interior

For fashion

People also use #166FC3 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 5.1:1. Use

Subtle surface Use #D1E2F3 for cards and hover fills. Tint 80

Avoid beside #1636C5 — 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 #166FC3 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #166FC3;
  --color-base-rgb: 22 111 195;
  --color-base-oklch: oklch(53.8% 0.153 252.5);
  --color-50: #F1F8FE;
  --color-100: #D9EBFC;
  --color-200: #B6D7F7;
  --color-300: #84B9EB;
  --color-400: #579BDB;
  --color-500: #347DC1;
  --color-600: #2F6393;
  --color-700: #274868;
  --color-800: #1D3144;
  --color-900: #141F29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  true-blue: {
    50: '#F1F8FE',
    100: '#D9EBFC',
    200: '#B6D7F7',
    300: '#84B9EB',
    400: '#579BDB',
    500: '#347DC1',
    600: '#2F6393',
    700: '#274868',
    800: '#1D3144',
    900: '#141F29',
  },
}

$base: #166FC3;
$base-ink: #FFFFFF;
$base-50: #F1F8FE;
$base-100: #D9EBFC;
$base-200: #B6D7F7;
$base-300: #84B9EB;
$base-400: #579BDB;
$base-500: #347DC1;
$base-600: #2F6393;
$base-700: #274868;
$base-800: #1D3144;
$base-900: #141F29;
$base-hover: #125A9E;
$base-subtle: #B9D4EE;

{
    "color": {
        "base": {
            "value": "#166FC3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F8FE",
                "type": "color"
            },
            "100": {
                "value": "#D9EBFC",
                "type": "color"
            },
            "200": {
                "value": "#B6D7F7",
                "type": "color"
            },
            "300": {
                "value": "#84B9EB",
                "type": "color"
            },
            "400": {
                "value": "#579BDB",
                "type": "color"
            },
            "500": {
                "value": "#347DC1",
                "type": "color"
            },
            "600": {
                "value": "#2F6393",
                "type": "color"
            },
            "700": {
                "value": "#274868",
                "type": "color"
            },
            "800": {
                "value": "#1D3144",
                "type": "color"
            },
            "900": {
                "value": "#141F29",
                "type": "color"
            }
        }
    }
}

Palettes built on #166FC3

Color Lab

Pairs with #166FC3

UI roles & guardrails

In real applications

Scales

Every model

Export