What color is #646DCD?

#646DCD is a medium blue-violet. In RGB it is rgb(100, 109, 205), and in HSL hsl(235, 51%, 60%).

Is #646DCD accessible as text?

On white, #646DCD has a contrast ratio of 4.55:1 (passes WCAG AA for body text); on black it is 4.61:1 (passes). For text placed on #646DCD, use black for the best readability.

What is the closest Tailwind color to #646DCD?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #646DCD?

#646DCD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CDC465. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #646DCD below.

Is #646DCD good for buttons?

#646DCD works for buttons; black text has the higher contrast, so prefer it for labels.

Is #646DCD the same as CSS slateblue?

No — #646DCD is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#646DCD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #646DCD

Not just a swatch — here's how #646DCD works with other colors. Named schemes with #646DCD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #646DCD Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

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

Vintage Leather Lead · 5 colors

Lead #646DCD Secondary #7F4534 Surface #EED7C2 Accent #365247 Anchor #582239

Slate Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Modern Café Dominant · 5 colors

Dominant #646DCD Anchor #3B2923 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Slate Blue anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Berry & Cream Lead · 5 colors

Lead #646DCD Surface #F6E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

Slate 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 #646DCD Secondary #9AA0C3 Support #9D9088 Ink #18140F

Slate 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 Slate Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #646DCD 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 20/100

Cool

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

Softness 43/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 44/100

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 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 48/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 97/100

Very high

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

Surface fit 15/100

Very low

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

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #646DCD

For UI

For branding

For interior

For fashion

People also use #646DCD with

Maya Blue Amethyst Dark Khaki Gainsboro Prussian Blue

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 4.6:1. Use

Subtle surface Use #E3E4F2 for cards and hover fills. Tint 80

Avoid beside #7F65CD — 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 #646DCD 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: #646DCD;
  --color-base-rgb: 100 109 205;
  --color-base-oklch: oklch(57.4% 0.146 276.7);
  --color-50: #F3F4FC;
  --color-100: #E0E1F6;
  --color-200: #C1C5EB;
  --color-300: #979CD9;
  --color-400: #6F76C3;
  --color-500: #4E55A7;
  --color-600: #414681;
  --color-700: #33365C;
  --color-800: #24263D;
  --color-900: #181926;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  slate-blue: {
    50: '#F3F4FC',
    100: '#E0E1F6',
    200: '#C1C5EB',
    300: '#979CD9',
    400: '#6F76C3',
    500: '#4E55A7',
    600: '#414681',
    700: '#33365C',
    800: '#24263D',
    900: '#181926',
  },
}

$base: #646DCD;
$base-ink: #141310;
$base-50: #F3F4FC;
$base-100: #E0E1F6;
$base-200: #C1C5EB;
$base-300: #979CD9;
$base-400: #6F76C3;
$base-500: #4E55A7;
$base-600: #414681;
$base-700: #33365C;
$base-800: #24263D;
$base-900: #181926;
$base-hover: #3C46B9;
$base-subtle: #D5D7EC;

{
    "color": {
        "base": {
            "value": "#646DCD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FC",
                "type": "color"
            },
            "100": {
                "value": "#E0E1F6",
                "type": "color"
            },
            "200": {
                "value": "#C1C5EB",
                "type": "color"
            },
            "300": {
                "value": "#979CD9",
                "type": "color"
            },
            "400": {
                "value": "#6F76C3",
                "type": "color"
            },
            "500": {
                "value": "#4E55A7",
                "type": "color"
            },
            "600": {
                "value": "#414681",
                "type": "color"
            },
            "700": {
                "value": "#33365C",
                "type": "color"
            },
            "800": {
                "value": "#24263D",
                "type": "color"
            },
            "900": {
                "value": "#181926",
                "type": "color"
            }
        }
    }
}

Palettes built on #646DCD

Color Lab

Pairs with #646DCD

UI roles & guardrails

In real applications

Scales

Every model

Export