What color is #401DDD?

#401DDD is a medium, vivid indigo. In RGB it is rgb(64, 29, 221), and in HSL hsl(251, 77%, 49%).

Is #401DDD accessible as text?

On white, #401DDD has a contrast ratio of 8.61:1 (passes WCAG AA for body text); on black it is 2.44:1 (fails). For text placed on #401DDD, use white for the best readability.

What is the closest Tailwind color to #401DDD?

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

What colors go well with #401DDD?

#401DDD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BADD1D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #401DDD below.

Is #401DDD good for buttons?

#401DDD works well for buttons and highlights, but use white text on #401DDD — black text only reaches 2.44:1, below the 4.5:1 needed for normal-size labels.

Is #401DDD the same as CSS blue?

No — #401DDD is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#401DDD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #401DDD

Not just a swatch — here's how #401DDD works with other colors. Named schemes with #401DDD in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #401DDD Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5A59FA

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.

Berry & Cream Lead · 5 colors

Lead #401DDD 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 #401DDD Secondary #6E77B1 Support #9D9088 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.

Coastal Morning Lead · 5 colors

Lead #401DDD Accent #A5C4C2 Surface #EAD5BF 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.

Sunset Warmth Glow · 5 colors

Glow #401DDD Secondary #E86A72 Accent #F6924E Anchor #583B57 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 #401DDD 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 15/100

Cool

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

Softness 23/100

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 5/100

Very low

Clean and current — no dusty, aged cast.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 99/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 51/100

Moderate

Workable accent with care around contrast.

Surface fit 11/100

Very low

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

Print safety 59/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #401DDD

For UI

For branding

For interior

For fashion

People also use #401DDD with

Signal Blue Dark Orchid Yellow Green 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 8.6:1. Use

Subtle surface Use #DCD7F3 for cards and hover fills. Tint 80

Avoid beside #801DDD — 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 #401DDD 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: #401DDD;
  --color-base-rgb: 64 29 221;
  --color-base-oklch: oklch(44.6% 0.257 276.3);
  --color-50: #F3F1FE;
  --color-100: #E0DAFB;
  --color-200: #C2B7F5;
  --color-300: #9886E9;
  --color-400: #7159D9;
  --color-500: #4F37BE;
  --color-600: #433191;
  --color-700: #342866;
  --color-800: #251E43;
  --color-900: #181429;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F3F1FE',
    100: '#E0DAFB',
    200: '#C2B7F5',
    300: '#9886E9',
    400: '#7159D9',
    500: '#4F37BE',
    600: '#433191',
    700: '#342866',
    800: '#251E43',
    900: '#181429',
  },
}

$base: #401DDD;
$base-ink: #FFFFFF;
$base-50: #F3F1FE;
$base-100: #E0DAFB;
$base-200: #C2B7F5;
$base-300: #9886E9;
$base-400: #7159D9;
$base-500: #4F37BE;
$base-600: #433191;
$base-700: #342866;
$base-800: #251E43;
$base-900: #181429;
$base-hover: #3317B1;
$base-subtle: #CAC1EF;

{
    "color": {
        "base": {
            "value": "#401DDD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FE",
                "type": "color"
            },
            "100": {
                "value": "#E0DAFB",
                "type": "color"
            },
            "200": {
                "value": "#C2B7F5",
                "type": "color"
            },
            "300": {
                "value": "#9886E9",
                "type": "color"
            },
            "400": {
                "value": "#7159D9",
                "type": "color"
            },
            "500": {
                "value": "#4F37BE",
                "type": "color"
            },
            "600": {
                "value": "#433191",
                "type": "color"
            },
            "700": {
                "value": "#342866",
                "type": "color"
            },
            "800": {
                "value": "#251E43",
                "type": "color"
            },
            "900": {
                "value": "#181429",
                "type": "color"
            }
        }
    }
}

Palettes built on #401DDD

Color Lab

Pairs with #401DDD

UI roles & guardrails

In real applications

Scales

Every model

Export