What color is #307BF4?

#307BF4 is a medium, vivid blue. In RGB it is rgb(48, 123, 244), and in HSL hsl(217, 90%, 57%).

Is #307BF4 accessible as text?

On white, #307BF4 has a contrast ratio of 3.99:1 (fails WCAG AA for body text); on black it is 5.27:1 (passes). For text placed on #307BF4, use black for the best readability.

What is the closest Tailwind color to #307BF4?

The nearest Tailwind CSS token is blue-500 (#2B7FFF).

What colors go well with #307BF4?

#307BF4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F4A82F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #307BF4 below.

Is #307BF4 good for buttons?

#307BF4 works well for buttons and highlights, but use black text on #307BF4 — white text only reaches 3.99:1, below the 4.5:1 needed for normal-size labels.

Is #307BF4 the same as CSS royalblue?

No — #307BF4 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#307BF4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #307BF4

Not just a swatch — here's how #307BF4 works with other colors. Named schemes with #307BF4 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #307BF4 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5FA3FF

Azure is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Azure.

Coastal Morning Lead · 5 colors

Lead #307BF4 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Azure 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 #307BF4 Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Azure 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 #307BF4 Secondary #93ADD8 Support #9D8F88 Ink #16140F

Azure 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 Azure carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #307BF4 Secondary #E76A76 Accent #F79152 Anchor #573B58 Surface #EEEBD6

Azure 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 #307BF4 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 42/100

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 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 76/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 80/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 17/100

Very low

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

Print safety 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #307BF4

For UI

For branding

For interior

For fashion

People also use #307BF4 with

Electric Blue Han Purple Marigold Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AA

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.7:1. Use

Subtle surface Use #DBE6F7 for cards and hover fills. Tint 80

Avoid beside #2F39F4 — 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 #307BF4 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: #307BF4;
  --color-base-rgb: 48 123 244;
  --color-base-oklch: oklch(60.4% 0.196 259.8);
  --color-50: #F0F6FE;
  --color-100: #D8E6FD;
  --color-200: #B2CEFB;
  --color-300: #7EAAF2;
  --color-400: #4F88E3;
  --color-500: #2B68CA;
  --color-600: #295499;
  --color-700: #233F6C;
  --color-800: #1B2B46;
  --color-900: #121C2B;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  azure: {
    50: '#F0F6FE',
    100: '#D8E6FD',
    200: '#B2CEFB',
    300: '#7EAAF2',
    400: '#4F88E3',
    500: '#2B68CA',
    600: '#295499',
    700: '#233F6C',
    800: '#1B2B46',
    900: '#121C2B',
  },
}

$base: #307BF4;
$base-ink: #141310;
$base-50: #F0F6FE;
$base-100: #D8E6FD;
$base-200: #B2CEFB;
$base-300: #7EAAF2;
$base-400: #4F88E3;
$base-500: #2B68CA;
$base-600: #295499;
$base-700: #233F6C;
$base-800: #1B2B46;
$base-900: #121C2B;
$base-hover: #0C5CDD;
$base-subtle: #C8D9F5;

{
    "color": {
        "base": {
            "value": "#307BF4",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E6FD",
                "type": "color"
            },
            "200": {
                "value": "#B2CEFB",
                "type": "color"
            },
            "300": {
                "value": "#7EAAF2",
                "type": "color"
            },
            "400": {
                "value": "#4F88E3",
                "type": "color"
            },
            "500": {
                "value": "#2B68CA",
                "type": "color"
            },
            "600": {
                "value": "#295499",
                "type": "color"
            },
            "700": {
                "value": "#233F6C",
                "type": "color"
            },
            "800": {
                "value": "#1B2B46",
                "type": "color"
            },
            "900": {
                "value": "#121C2B",
                "type": "color"
            }
        }
    }
}