What color is #6440DA?

#6440DA is a medium indigo. In RGB it is rgb(100, 64, 218), and in HSL hsl(254, 68%, 55%).

Is #6440DA accessible as text?

On white, #6440DA has a contrast ratio of 6.39:1 (passes WCAG AA for body text); on black it is 3.29:1 (fails). For text placed on #6440DA, use white for the best readability.

What is the closest Tailwind color to #6440DA?

The nearest Tailwind CSS token is indigo-600 (#4F39F6).

What colors go well with #6440DA?

#6440DA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B6DA3E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #6440DA below.

Is #6440DA good for buttons?

#6440DA works well for buttons and highlights, but use white text on #6440DA — black text only reaches 3.29:1, below the 4.5:1 needed for normal-size labels.

Is #6440DA the same as CSS slateblue?

No — #6440DA is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#6440DA Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #6440DA

Not just a swatch — here's how #6440DA works with other colors. Named schemes with #6440DA in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #6440DA Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #846EF8

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

Berry & Cream Lead · 5 colors

Lead #6440DA Surface #F5E5D7 Anchor #5B2141 Accent #E5C2C8 Secondary #332B2F

Iris 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 #6440DA Secondary #8B88BC Support #9D9088 Ink #18140F

Iris 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 Iris carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #6440DA Accent #A5C4C3 Surface #E9D5BF Secondary #9AA0A1 Anchor #22334A

Iris 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 #6440DA Secondary #E86A6F Accent #F5934C Anchor #583B57 Surface #F7E7D7

Iris 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 #6440DA 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 22/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 53/100

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 19/100

Very low

Clean and current — no dusty, aged cast.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 85/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 77/100

High

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

Surface fit 8/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #6440DA

For UI

For branding

For interior

For fashion

People also use #6440DA with

Cornflower Blue Medium Orchid Pear Gainsboro Russian Violet

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 6.4:1. Use

Subtle surface Use #E2DDF3 for cards and hover fills. Tint 80

Avoid beside #973EDA — 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 #6440DA 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: #6440DA;
  --color-base-rgb: 100 64 218;
  --color-base-oklch: oklch(50.9% 0.220 286.4);
  --color-50: #F4F2FD;
  --color-100: #E3DCF9;
  --color-200: #C7BBF2;
  --color-300: #A08CE3;
  --color-400: #7B61D1;
  --color-500: #5A3FB6;
  --color-600: #4A378B;
  --color-700: #392C63;
  --color-800: #282041;
  --color-900: #1A1528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  iris: {
    50: '#F4F2FD',
    100: '#E3DCF9',
    200: '#C7BBF2',
    300: '#A08CE3',
    400: '#7B61D1',
    500: '#5A3FB6',
    600: '#4A378B',
    700: '#392C63',
    800: '#282041',
    900: '#1A1528',
  },
}

$base: #6440DA;
$base-ink: #FFFFFF;
$base-50: #F4F2FD;
$base-100: #E3DCF9;
$base-200: #C7BBF2;
$base-300: #A08CE3;
$base-400: #7B61D1;
$base-500: #5A3FB6;
$base-600: #4A378B;
$base-700: #392C63;
$base-800: #282041;
$base-900: #1A1528;
$base-hover: #4824BC;
$base-subtle: #D3CBEE;

{
    "color": {
        "base": {
            "value": "#6440DA",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F2FD",
                "type": "color"
            },
            "100": {
                "value": "#E3DCF9",
                "type": "color"
            },
            "200": {
                "value": "#C7BBF2",
                "type": "color"
            },
            "300": {
                "value": "#A08CE3",
                "type": "color"
            },
            "400": {
                "value": "#7B61D1",
                "type": "color"
            },
            "500": {
                "value": "#5A3FB6",
                "type": "color"
            },
            "600": {
                "value": "#4A378B",
                "type": "color"
            },
            "700": {
                "value": "#392C63",
                "type": "color"
            },
            "800": {
                "value": "#282041",
                "type": "color"
            },
            "900": {
                "value": "#1A1528",
                "type": "color"
            }
        }
    }
}

Palettes built on #6440DA

Color Lab

Pairs with #6440DA

UI roles & guardrails

In real applications

Scales

Every model

Export