What color is #3003FB?

#3003FB is a medium, vivid indigo. In RGB it is rgb(48, 3, 251), and in HSL hsl(251, 98%, 50%).

Is #3003FB accessible as text?

On white, #3003FB has a contrast ratio of 8.29:1 (passes WCAG AA for body text); on black it is 2.53:1 (fails). For text placed on #3003FB, use white for the best readability.

What is the closest Tailwind color to #3003FB?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #3003FB?

#3003FB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CFFC03. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3003FB below.

Is #3003FB good for buttons?

#3003FB works well for buttons and highlights, but use white text on #3003FB — black text only reaches 2.53:1, below the 4.5:1 needed for normal-size labels.

Is #3003FB the same as CSS blue?

No — #3003FB is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#3003FB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3003FB

Not just a swatch — here's how #3003FB works with other colors. Named schemes with #3003FB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3003FB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #465AFF

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

Coastal Morning Lead · 5 colors

Lead #3003FB Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Ultramarine 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 #3003FB Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Ultramarine 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 #3003FB Secondary #687DBF Support #9D8F88 Ink #18140F

Ultramarine 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 Ultramarine carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #3003FB Secondary #E86A73 Accent #F69250 Anchor #573B58 Surface #F7E7D7

Ultramarine 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 #3003FB 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 12/100

Cool

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

Softness 19/100

Very low

Firm and assertive — carries weight and contrast.

Depth 62/100

High

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 0/100

Very low

Clean and current — no dusty, aged cast.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 100/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 33/100

Low

Workable accent with care around contrast.

Surface fit 10/100

Very low

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

Print safety 49/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #3003FB

For UI

For branding

For interior

For fashion

People also use #3003FB with

Azure Electric Purple Pear Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

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 8.3:1. Use

Subtle surface Use #DAD4F7 for cards and hover fills. Tint 80

Avoid beside #8403FC — 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 #3003FB 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: #3003FB;
  --color-base-rgb: 48 3 251;
  --color-base-oklch: oklch(46.1% 0.300 270.2);
  --color-50: #F3F0FE;
  --color-100: #DFD8FD;
  --color-200: #BEB1FC;
  --color-300: #9078F7;
  --color-400: #6648EA;
  --color-500: #4424D1;
  --color-600: #3A249E;
  --color-700: #2E206F;
  --color-800: #221948;
  --color-900: #16112C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F3F0FE',
    100: '#DFD8FD',
    200: '#BEB1FC',
    300: '#9078F7',
    400: '#6648EA',
    500: '#4424D1',
    600: '#3A249E',
    700: '#2E206F',
    800: '#221948',
    900: '#16112C',
  },
}

$base: #3003FB;
$base-ink: #FFFFFF;
$base-50: #F3F0FE;
$base-100: #DFD8FD;
$base-200: #BEB1FC;
$base-300: #9078F7;
$base-400: #6648EA;
$base-500: #4424D1;
$base-600: #3A249E;
$base-700: #2E206F;
$base-800: #221948;
$base-900: #16112C;
$base-hover: #2702CA;
$base-subtle: #C7BCF5;

{
    "color": {
        "base": {
            "value": "#3003FB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DFD8FD",
                "type": "color"
            },
            "200": {
                "value": "#BEB1FC",
                "type": "color"
            },
            "300": {
                "value": "#9078F7",
                "type": "color"
            },
            "400": {
                "value": "#6648EA",
                "type": "color"
            },
            "500": {
                "value": "#4424D1",
                "type": "color"
            },
            "600": {
                "value": "#3A249E",
                "type": "color"
            },
            "700": {
                "value": "#2E206F",
                "type": "color"
            },
            "800": {
                "value": "#221948",
                "type": "color"
            },
            "900": {
                "value": "#16112C",
                "type": "color"
            }
        }
    }
}

Palettes built on #3003FB

Color Lab

Pairs with #3003FB

UI roles & guardrails

In real applications

Scales

Every model

Export