What color is #305BDB?

#305BDB is a medium, vivid blue. In RGB it is rgb(48, 91, 219), and in HSL hsl(225, 70%, 52%).

Is #305BDB accessible as text?

On white, #305BDB has a contrast ratio of 5.76:1 (passes WCAG AA for body text); on black it is 3.65:1 (fails). For text placed on #305BDB, use white for the best readability.

What is the closest Tailwind color to #305BDB?

The nearest Tailwind CSS token is blue-600 (#155DFC).

What colors go well with #305BDB?

#305BDB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DAAF2F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #305BDB below.

Is #305BDB good for buttons?

#305BDB works well for buttons and highlights, but use white text on #305BDB — black text only reaches 3.65:1, below the 4.5:1 needed for normal-size labels.

Is #305BDB the same as CSS royalblue?

No — #305BDB is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#305BDB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #305BDB

Not just a swatch — here's how #305BDB works with other colors. Named schemes with #305BDB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #305BDB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5784F9

Royal 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 Royal Blue.

Coastal Morning Lead · 5 colors

Lead #305BDB Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Royal Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Berry & Cream Lead · 5 colors

Lead #305BDB Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Royal Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #305BDB Secondary #7E92BF Support #9D8F88 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #305BDB Secondary #E86A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Royal Blue glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #305BDB 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 9/100

Cool

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 78/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 86/100

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 63/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #305BDB

For UI

For branding

For interior

For fashion

People also use #305BDB with

Lagoon Blue Han Purple Mustard Yellow 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 5.8:1. Use

Subtle surface Use #DAE0F3 for cards and hover fills. Tint 80

Avoid beside #3D2FDA — 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 #305BDB 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: #305BDB;
  --color-base-rgb: 48 91 219;
  --color-base-oklch: oklch(52.1% 0.202 265.5);
  --color-50: #F1F4FD;
  --color-100: #DBE3FA;
  --color-200: #BAC8F3;
  --color-300: #8AA1E5;
  --color-400: #5F7CD3;
  --color-500: #3D5CB8;
  --color-600: #354B8C;
  --color-700: #2B3964;
  --color-800: #202841;
  --color-900: #151A28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F1F4FD',
    100: '#DBE3FA',
    200: '#BAC8F3',
    300: '#8AA1E5',
    400: '#5F7CD3',
    500: '#3D5CB8',
    600: '#354B8C',
    700: '#2B3964',
    800: '#202841',
    900: '#151A28',
  },
}

$base: #305BDB;
$base-ink: #FFFFFF;
$base-50: #F1F4FD;
$base-100: #DBE3FA;
$base-200: #BAC8F3;
$base-300: #8AA1E5;
$base-400: #5F7CD3;
$base-500: #3D5CB8;
$base-600: #354B8C;
$base-700: #2B3964;
$base-800: #202841;
$base-900: #151A28;
$base-hover: #2045B4;
$base-subtle: #C7D1EE;

{
    "color": {
        "base": {
            "value": "#305BDB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE3FA",
                "type": "color"
            },
            "200": {
                "value": "#BAC8F3",
                "type": "color"
            },
            "300": {
                "value": "#8AA1E5",
                "type": "color"
            },
            "400": {
                "value": "#5F7CD3",
                "type": "color"
            },
            "500": {
                "value": "#3D5CB8",
                "type": "color"
            },
            "600": {
                "value": "#354B8C",
                "type": "color"
            },
            "700": {
                "value": "#2B3964",
                "type": "color"
            },
            "800": {
                "value": "#202841",
                "type": "color"
            },
            "900": {
                "value": "#151A28",
                "type": "color"
            }
        }
    }
}